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bluetooth review For Your Reading Pleasure
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 bluetooth wireless other noise sources, such as microwaves.

To overcome bluetooth wireless 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 bluetooth 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 bluetooth 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 bluetooth range bluetooth wireless is far enough for bluetooth headphones wireless communication
but bluetooth printer close enough to avoid drawing too much power
from the power source of the device bluetooth printer.

bluetooth review and More
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Featured bluetooth review Items
Ecom North DLX48 3-in-1 GPS for Navigation Bluetooth Receiver, Photo Shooting / Photo Tagger (Flickr, Google Earth) and Data Logger / Travel Tracker Tracking

Ecom North DLX48 3-in-1 GPS for Navigation Bluetooth Receiver, Photo Shooting / Photo Tagger (Flickr, Google Earth) and Data Logger / Travel Tracker Tracking
The DLX48 is the industry leading Bluetooth GPS receiver that offers simultaneous use of real-time GPS reception and data logging. The it's features extended battery life, (up to 14 hours) with rechargeable battery and increased memory size. It can interface with any Bluetooth -enable mobile device to provide GPS data to applications. The DLX48 is capable of keeping up to 800,000 records or positions, including longitude, latitude, speed, UTC, and tag data. The log file can be downloaded for analysis via high-speed USB connection, the location histories can also be exported to mapping software such as Google Earth.

With the Skytraq 44 channels high sensitivity built-in chipset is an user friendly, and a must-have GPS device if you travel with a GPS application for Road Navigation, Position Tracking or Photo Shooting. It supports PDA, Pocket PC, SmartPhone, Laptop and more to receive GPS data, as long as your device supports the Bluetooth technology, and your device is able to run your favorite GPS navigation map application, then you are on the way to your destination without losing again.

The DLX48 is tiny and lightweight design easily to fit in your hand or pocket (dimension: 2.75 x 1.1 x 0.75 inches, 0.88 oz excluded the battery, known as the smallest GPS receiver on the market); it's built-in with the lowest power consumption chipset, so that the rechargeable battery serving time will last a lot longer per each charge, up to 12~14 hrs after fully charged. You can charge the DLX48 from your computer through a provided USB cable or a provided car charger kit; they are included in the package. The GPS receiver can be charged and transmit the GPS signals to your device simultaneously, such as you can charge the receiver at the same time when the GPS receiver is running without any interruption.

Scala 700 Bluetooth Headset AC Charger

Scala 700 Bluetooth Headset AC Charger
Cardo Scala 600/ Scala 700/ Scala 750 Battery Charger Travel Charger/ AC charger for Cardo Scala 600/ Scala 700/ Scala 750 Bluetooth models. Factory original 110-120 volt AC Battery Home Charger/ Travel Charger/ AC charger. Cardo Scala 600/ Scala 700/ Scala 750 Travel Charger/ AC charger Plug is built & designed specifically for your Cardo Scala 600/ Scala 700/ Scala 750 Bluetooth headset. Cardo Scala 600/ Scala 700/ Scala 750 battery charger quickly plugs into your home 110-120 volt AC outlet as a Travel Charger/ AC charger for a rapid battery charge to keep your Cardo Scala 600/ Scala 700/ Scala 750 Bluetooth battery in top operating condition. This Cardo Scala 600/ Scala 700/ Scala 750 rapid home charger/ travel charger immediately operates your Cardo Scala 600/ Scala 700/ Scala 750 Bluetooth when attached to a rechargeable battery. This is the Factory Original Cardo Scala 600/ Scala 700/ Scala 750 Battery Charger Travel Charger/ AC charger with a one year warranty. Cardo Scala 600/ Scala 700/ Scala 750 battery charger is Discounted for GREAT VALUE!Supported Models and Categories:UTStarcom CDM1450/ Super Slice Cell Phone AccessoriesAudiovox SMT-5600 / SPV-C500 (HTC Typhoon) Cell Phone AccessoriesUTStarcom XV6800/ PPC6800/ HTC Titan Cell Phone AccessoriesUTStarcom CDM8935 Cell Phone AccessoriesG'zOne Type-S AccessoriesPPC6600/ HTC Harrier AccessoriesPPC6700/ HTC Apache accessoriesDanger Sidekick 3 Series AccessoriesK700 Series AccessoriesK800/K790 Series AccessoriesK850i Series AccessoriesM600i Series AccessoriesP800/P900 Series AccessoriesP910 Series AccessoriesP990 Series AccessoriesS700 Series AccessoriesT28/T39/R320/R520 Series AccessoriesT608/T610/T616 Series AccessoriesT630/637 Series AccessoriesT68 Series AccessoriesW300i/Z530 Series AccessoriesW580/ S500 Series accessoriesW600/W550 Series Accessoriesw710 Series AccessoriesW800i/ K750i series accessoriesW810i series accessoriesW950i Series AccessoriesZ310 Series AccessoriesZ520 Series AccessoriesZ550 S

Nokia BH-200 Bluetooth Black Headset

Nokia BH-200 Bluetooth Black Headset
Nokia BH-200/ HS-58w Bluetooth hands-free headset with Captive ear-hook for All Bluetooth enabled cell phone models using either Hands-Free or Headset profile.Compatible Bluetooth enabled cell phone models are listed here!Nokia BH-200/ HS-58w Bluetooth over-ear headset with Captive ear-hook for hands free ease! Black on Gray color is stylish and matches Nokia colors. Conveniently loop the Nokia BH-200/ HS-58w Bluetooth Captive ear-hook over either ear. Nokia BH-200/ HS-58w Bluetooth headset is .49 ounce for a lightweight earpiece design & comfortable fit. Small in size at only 1.9 x 0.87 x 0.83 inches. Nokia BH-200/ HS-58w headset includes Send/ End button Redial Activate Voice Dialing Mute & Volume control. You can even switch between hands-free mode and phone mode. Nokia BH-200/ HS-58w Bluetooth Wireless hands free headset enables you to move up to 33 feet away from your Bluetooth enabled cell phone and still stay connected. Supports Bluetooth versions 2.0 (EDR) 1.2 and 1.1 FeaturesCall handling from headset. Large Answer/ end call control. Redial last number. Voice tag activation. Switch between handset and hands-free modes. Mute. Volume control. Compatible chargers are the ACP-3u (included) and DC-4 (Sold separately). You may use any of these Nokia ACP-3 ACP-4 or DC-4 chargers (purchase seperately). Up to 5.5 hour talk-time OR up to 150 hours standby time before recharging with the included AC-3U charger. Factory original one year warranty applies. Supported Models and Categories:UTStarcom CDM1450/ Super Slice Cell Phone AccessoriesAudiovox SMT-5600 / SPV-C500 (HTC Typhoon) Cell Phone AccessoriesUTStarcom XV6800/ PPC6800/ HTC Titan Cell Phone AccessoriesUTStarcom CDM8935 Cell Phone AccessoriesG'zOne Type-S AccessoriesPPC6600/ HTC Harrier AccessoriesPPC6700/ HTC Apache accessoriesDanger Sidekick 3 Series AccessoriesK700 Series AccessoriesK800/K790 Series AccessoriesK850i Series AccessoriesM600i Series AccessoriesP800/P900 Series AccessoriesP910 Series Access

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8th January - A review by Geek.Com on Qualcomm's new eagerly ... - MobileGuru (press release)

Tue, 08 Jan 2008 10:15:31 GMT

MobileGuru (press release)

8th January - A review by Geek.Com on Qualcomm's new eagerly ... MobileGuru (press release), UK - 6 hours ago This is based on Qualcomm’s Snapdragon platform so it will use a 1.0GHz processor (said to operate at 1/2 watt peak) along with WiFi, Bluetooth, GPS, ...

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