How Bluetooth Works

Bluetooth devices will normally operate at 2.4 GHZ
in the license free, globally available ISM radio
band. The advantage to this band includes worldwide
availability and compatibility. A disadvantage to
this however, is that the devices must share this
band with other RF emitters. This includes
automobile security systems, other wireless devices,
and other noise sources, such as microwaves.

To overcome this challenge, Bluetooth employs a
fast frequency hopping scheme and therefore uses
shorter packets than other standards within the
ISM band. This scheme helps to make Bluetooth
communication more robust and more secure.

Frequency hopping
Frequency hopping is basically jumping from frequency
to frequency within the ISM radio band. After a
bluetooth device sends or receives a packet, it
and the device (or devices) it’s communicating with
hop to another frequency before the next packet is
sent. This scheme offers three advantages:
1. Allows Bluetooth devices to use the
entirety of the available ISM band, while never
transmitting from a fixed frequency for more than a
short period of time. This helps insure that
Bluetooth conforms to the ISM restrictions on the
transmission quantity per frequency.
2. Ensures that any interference won’t
last long. Any packet that doesn’t arrive safely
to its destination can be resent to the next
frequency.
3. Provides a base level of security as
it’s very hard for an eavesdropping device to predict
which frequency the Bluetooth devices will use
next.

The connected devices however, must agree upon the
frequency they will use next. The specification
in Bluetooth ensures this in two ways. First, it
defines a master and slave type relationship between
bluetooth devices. Next, it specifies an algorithm
that uses device specific information when
calculating the frequency hop sequences.

A Bluetooth device that operates in master mode can
communicate with up to seven devices that are set in
slave mode. To each of the slaves, the master
Bluetooth device will send its own unique address
and the value of its own internal clock. The
information sent is then used to calculate the
frequency hop sequences.

Because the master device and each of the slave
devices use the same algorithm with the same initial
input, the connected devices will always arrive
together at the next frequency that they have agreed
upon.

As a replacement for cable technology, it’s no
wonder that Bluetooth devices are usually battery
powered, such as wireless mice and battery powered
cell phones. To conserve the power, most devices
operate in low power. This helps to give Bluetooth
devices a range of around 5 – 10 meters.

This range is far enough for wireless communication
but close enough to avoid drawing too much power
from the power source of the device.

Bluetooth And Apple

The new Apple powerbook G4 are among the first
computers to offer Bluetooth technology 2.0+EDR.
The 2.0+EDR technology, which still backwards
compatible with 1.0, is up to three times faster
than previous versions, offering maximum data rate
transfers of up to 3 MBps. Being the first company
to certify a system with 2.0+EDR, Apple continues
to make great use of the Bluetooth technology.

Full support
In addition to the powerbook G4 portables, there
are other Bluetooth enabled computers available
from Apple, including the iBook, iMac G5, eMac,
and the Power Mac G5.

Making life easier
When you turn the Bluetooth feature on, your Mac
can easily perform a file transfer or even a
synchronization. From the Bluetooth selection
menu, you can choose to either send a file or
browse devices, quickly and easily. Or, you can
click the sync button in iSync to update your
cell phone or Palm OS handheld.

The Mac and GSM/GPRS mobile phone with Bluetooth
work to make each other more useful. By using
iSync, you can keep your phone updated without
having to type any info, as you can keep the
information in the more manageable address book
on your Mac instead.

You can also use your Bluetooth enabled Mac to
print documents and digital images to select a
printer that also supports the technology of
Bluetooth. Or, you can also use a headset to
talk to your friends during an iChat session.

Your Mac also has the ability to use Bluetooth
technology to communicate with your Palm OS
handheld. This way, you can perform a HotSync
operation without using any cables. You can also
send your business card or calendar events directly
to someone else’s handheld usingthe technology of
Bluetooth.

The implementation of Bluetooth by Apple is the
latest in a series of moves that have caused
great shift in the computer industry. Apple
established USB as the standard interface with
the launching of the first Mac back in 1998.

Since then, Apple established the 802.11 wireless
standard of networking with the launch of the
iBook and AirPort in 1999. During 2003, Apple
launched AirPort Extreme, which was based on
the new 802.11g high speed technology of wireless.

Now, Bluetooth helps to further strengthen the
dominant position of the Mac in wireless
communications, helping to preserve Apple’s
reputation for being the first to market with
innovative technology that integrates right into
the operating system.

Audiovox cellular phone accessory

Cellular phones have become one of the most functional modern day gadgets. It has evolved from being a luxurious toy for young professional into a necessity for the multi dimensional life of these young professionals.

However, cellular phones have different use for different people. Now, minors sport a cellular phone as a functional display, they consider it part of their wardrobe and flaunt having this modern day gadget in there complete get up. However, this is not the function of cellular phone to the business world.

They are necessities and not for dressing up. Because of the varied usefulness of cellular phones and the increasing need and want for easy communication, manufacturers are quick to take advantage of this booming industry.

Cellular phones and cellular phone accessories now flood the marketplace with different designs and different functionalities. Various cellular phone models and accessories including Audiovox cellular phone accessory comes in beautiful and functional designs.

Audiovox cellular phones and Audiovox cellular phone accessory can be such functional and comes with models that are lightweight and of beautiful designs. Audiovox cellular phone accessory such as premium power cord is a versatile power cord comes with cellular phone conditioning capacity.

Audiovox cellular phone accessory also include a hip clip holder that can be functional even when your cellular phone is not Audiovox. In addition, Audiovox cellular phone accessory such as headsets and ear glove produce a hands-free cellular phone function that will help you keep your hands on the wheels.

This will avoid accidents due to one hand driving and decreased attention on the road. Additionally, the over ear portable hands-free kit from the wide array of Audiovox cellular phone accessory line also functions to provide hands free telephony and had a built in feature that reduces background noise.

You will hear clearly the person on the other line, even while driving or doing other stuff. There is also that Jabra model of Audiovox cellular phone accessory, which is a headset that provides hands-free telephoning. Jabra is small, lighter that other headsets and stylish; it also functions as a speakerphone and thus is a more functional gadget for your cellular phone.

All these prove that Audivox cellular phone and Audiovox cellular phone accessory line are functional and technologically advance. Audiovox cellular phone accessory is a multi-functional accessory, it can function well with Audiovox cellular phone but it can also perform its functionality with other cellular phone brands.

There is also that Audiovox cellular phone accessory like the multi-functional antennae, this is attached to your car while you travel, and it functions well when you talk to another person on the other line while the car is in motion.

There are other antennas that limits their functions when you are mobile, not the antennae from the Audiovox cellular phone accessory line. This Audiovox cellular phone accessory design of antennae is very useful for travelers and corporate executives.

If you are looking for functionality in your cellular phone, try to find an Audiovox cellular phone and the matching Audiovox cellular earphone accessory for your communication requirements. They are very good for young professional who endeavor doing many things are the same time. Your Audiovox cellular phone and Audiovox cellular phone accessory line can compliment your highly active lifestyle.

Buy Digital Camera

Things You Need to Know Before You Buy Digital Camera

Digital cameras come in many sizes, colors, brands, zooms, resolutions, playbacks, etc. There are so many features and qualities that are being placed in the devices that buyers especially first timers become overwhelmed and dizzy with these outstanding arrays of gadgets. This is even without including the various advertisements and different ratings that are used to promote these products.

So what are the things to look for if you want to buy digital camera? To be able to answer these, there are 2 sets of information you have to know before you can decide. The first type of information is defining what YOU need and want in a digital camera. To do this, you can ask yourself the following questions:

– What do you want to take with your digital camera? Before you buy digital camera, it is important to determine what kind of pictures you want to take with it. If you are a digital photography enthusiast, any digital camera will not just do. You have to look for features that can support the zooming you need, the resolution, etc.

– How much is your budget? This is a very important question any person who intends to buy digital camera should ask. Because no matter what your needs and wants are for the device, your financial resource will play a huge part in dictating the type of digital camera you will buy.

– What are you resources? When you buy digital camera, sometimes the spending does not end there. You also have to consider the capacity and the power of the computer and the printer you will be hooking your camera with for your editing and printing needs. Editing software are already included when you buy digital camera but other devices aren’t. Aside from a printer, ink and paper for printing, you might also need additional memory cards for your camera and a more powerful computer to support image editing and image storage and retrieval.

After answering these 3 questions, the second set of information you need to know before you buy digital camera are the features that you need in the device. These are:

– Resolution. Before you buy digital camera, check first its capacity to produce high quality photo images. The number of pixels indicated determines resolution. The more number of pixels, the higher the resolution which can make photos to be enlarged without losing image quality.

– Built-in memory. Digital cameras need memory cards for picture storage. When you buy digital camera, make sure that the gadget that you buy does not only have a “built-in” memory but should also have a card slot for external and additional memory. This allows you to change full memory cards conveniently while shooting your pictures.

– Look and feel. It is essential for you to feel comfortable holding your digital camera while shooting. So, before you buy digital camera, it good to test and check if you are comfortable holding it and using it. Consider where the buttons are located and how they are spaced out and see also if you feel comfortable using the viewfinder.

– Battery life. Digital cameras use up batteries fast and batteries are expensive. Before you buy digital camera, consider if the camera’s batteries are rechargeable. This way you can recharge them. Take also into consideration an AC adapter when you buy digital camera. You can attach this to the camera when you are viewing your pictures or uploading them

– LCD. The LCD is a special consideration you have to look into when you buy a digital camera. This is a small screen located at the back of a digital camera that allows you to preview the pictures you took. This has to be considered when you buy digital camera because it uses up a lot of battery power.

– Special features. Special features that will suit your needs should be thought about, too before you buy digital camera. If you want your camera to have good zooming, you can opt for those with optical zoom lenses. A diopter adjustment on the digital camera’s viewfinder will also be beneficial to those who regularly wear glasses and wish to buy digital camera. Other features such as remote control, tripods, etc. can also be considered when you buy a digital camera.

With these information, you can now figure out what you really need and want before you buy digital camera. If you want to see ratings and rankings of these devices based on price, resolution or other features, check out various websites that have these in the Internet.

Things You Need to Know Before You Buy Digital Camera
Digital cameras come in many sizes, colors, brands, zooms, resolutions, playbacks, etc. There are so many features and qualities that are being placed in the devices that buyers especially first timers become overwhelmed and dizzy with these outstanding arrays of gadgets. This is even without including the various advertisements and different ratings that are used to promote these products.
So what are the things to look for if you want to buy digital camera? To be able to answer these, there are 2 sets of information you have to know before you can decide. The first type of information is defining what YOU need and want in a digital camera. To do this, you can ask yourself the following questions:
– What do you want to take with your digital camera? Before you buy digital camera, it is important to determine what kind of pictures you want to take with it. If you are a digital photography enthusiast, any digital camera will not just do. You have to look for features that can support the zooming you need, the resolution, etc.
– How much is your budget? This is a very important question any person who intends to buy digital camera should ask. Because no matter what your needs and wants are for the device, your financial resource will play a huge part in dictating the type of digital camera you will buy.
– What are you resources? When you buy digital camera, sometimes the spending does not end there. You also have to consider the capacity and the power of the computer and the printer you will be hooking your camera with for your editing and printing needs. Editing software are already included when you buy digital camera but other devices aren’t. Aside from a printer, ink and paper for printing, you might also need additional memory cards for your camera and a more powerful computer to support image editing and image storage and retrieval.
After answering these 3 questions, the second set of information you need to know before you buy digital camera are the features that you need in the device. These are:
– Resolution. Before you buy digital camera, check first its capacity to produce high quality photo images. The number of pixels indicated determines resolution. The more number of pixels, the higher the resolution which can make photos to be enlarged without losing image quality.
– Built-in memory. Digital cameras need memory cards for picture storage. When you buy digital camera, make sure that the gadget that you buy does not only have a “built-in” memory but should also have a card slot for external and additional memory. This allows you to change full memory cards conveniently while shooting your pictures.
– Look and feel. It is essential for you to feel comfortable holding your digital camera while shooting. So, before you buy digital camera, it good to test and check if you are comfortable holding it and using it. Consider where the buttons are located and how they are spaced out and see also if you feel comfortable using the viewfinder.
– Battery life. Digital cameras use up batteries fast and batteries are expensive. Before you buy digital camera, consider if the camera’s batteries are rechargeable. This way you can recharge them. Take also into consideration an AC adapter when you buy digital camera. You can attach this to the camera when you are viewing your pictures or uploading them
– LCD. The LCD is a special consideration you have to look into when you buy a digital camera. This is a small screen located at the back of a digital camera that allows you to preview the pictures you took. This has to be considered when you buy digital camera because it uses up a lot of battery power.
– Special features. Special features that will suit your needs should be thought about, too before you buy digital camera. If you want your camera to have good zooming, you can opt for those with optical zoom lenses. A diopter adjustment on the digital camera’s viewfinder will also be beneficial to those who regularly wear glasses and wish to buy digital camera. Other features such as remote control, tripods, etc. can also be considered when you buy a digital camera.
With these information, you can now figure out what you really need and want before you buy digital camera. If you want to see ratings and rankings of these devices based on price, resolution or other features, check out various websites that have these in the Internet.

The design of the new iPod video

The design of the new iPod video is similar to the previous editions, but it is thinner and has a slimmer build. The design was not surprising as it resembles a lot the others, but the new features and the improved once from the previous models were the ones who ensured the great success. The amazing feature is the dimension and the great capacities and features.

The new iPod video is about 10 percent thinner than the last generation iPod and has even a greater capacity – the 4th generation iPod had 20 GB and the iPod video has 30 or 60GB. The LCD display of the new iPod video has a larger format – 2.5-inch format with QVGA resolution. You may watch a video while 65,000 colors are being used, fact that is possible due to the special screen of great quality and the finishing touch of the design.

Most reviews point out the amazing design of the new iPod video, beaty that may easily caught the eye of any iPod fan. The sharp and colorful display is capable of increasing the great charm of this new item and may conquer any heart.

The special design is given with the help of the clear polycarbonate case which plays at the same time the role of a protective case for the new iPod. It is, in a way, a classic design with any new input following the modern fashionable trends and refusing to create a new face for the popular iPod. Maybe this is the aspect that continues to attract customers of all ages, this being an available option for almost all tastes and preferences. Besides, the cases ar those who may be chosen taking into account the age, color preference or other relevant aspects.

However, the slim design may be of great success, this being the new characteristic of the new iPod as compared with previous editions of iPods. Only with iPod nano and the 5th generation iPod the nuance of the interface was slightly changed, adding a “brushed-metal” effect.

Even if you are not in love with the new features of the new iPod video, you may not deny the fact that its design is wonderful. And from this point of view it may be considered the most successful handheld video device. That is why the new iPod video has no competitors and may be situated on the top list of pocket video devices. The design of this video device of the new generation is therefore very important. The design of the new iPod video represents more than the tastes of the nowadays generations, but also the specific lifestyle always in move and almost always in a hurry.

The simple and sleek design may be considered the most often mentioned advantage of the new iPod video. Some other mentioned advantages may also be included in the category of design – screen clarity, styling, very slim line, great integration with iTunes. The sleek design is also considered sexy by some customers in their reviews, fact that may point out the age of the customers, who use such a language – teenagers.

Some other characteristics of the iPod video design may be considered the great picture quality, crystal clear display, slim and sleek accessory and accessibility in the navigation system. The most often mentioned disadvantage of the design of the iPod video in the reviews is the easy scratched surface. Maybe this aspect may be considered as a complementary negative aspect of the design surface quality.

The most amazing aspect of the new iPod video design is the fact that it is provides complete waterproof protection. The new housing is said to offer great protection for the iPod’s video screen against scratches and other possible dangers or damages. Another special aspect concerns the fact that together with H2O Audio waterproof headphones it resists in a depth of 10 ft (3 meters).

Besides, there are available leather flip cases with special design that provides easy access to all needed buttons while the iPod video is inside the case