Bluetooth TechnologyBluetooth is a radio frequency (RF) specification for short-range, point-to-point and point-to-multipoint voice and data transfer. Bluetooth will allow users to connect to a wide range of computing and telecommunications devices without the need for proprietary cables that often fall short in terms of ease of use. A global specification for wireless connectivity: Bluetooth, named after the first Christian king of Denmark and not a serious dental condition, is the name of a technology specification for short-range, low-cost, small form factor radio links between PCs , PDAs, mobile phones and other IT and electronic devices. Bluetooth SIG (Special Interest Group) is an industry group made up of leaders in the telecommunications and information technology industries who are driving the development of the technology and bringing it to market. Over 2000 companies have signed the Bluetooth Adoption Agreement and are members of the Bluetooth SIG. Technical features: Note: A piconet is a collection of devices connected via Bluetooth technology in an ad hoc manner. A piconet starts with two connected devices, such as a laptop and a mobile phone, and can grow to eight connected devices. All Bluetooth devices are peer units and have identical implementations. However, when establishing a piconet, one unit will act as the master and the other(s) as the slave for the duration of the piconet connection. Bluetooth technology provides a 10-meter personal bubble that supports simultaneous transmission of both voice and data for multiple devices. Up to 8 data devices can be connected in one piconet, and up to 10 piconet can exist within a 10 meter bubble. Each piconet supports up to 3 simultaneous full duplex (CVSD) voice devices. The gross data rate is 1 Mb/s, but the actual data rate is 432 Kbps for full duplex transmission, 721/56 Kbps for asymmetric transmission, and 384 Kbps for TMS2000 transmission. A Time Division Duplex scheme is used for full-duplex transmission. Bluetooth uses a frequency hopping spread spectrum technique. Spectrum spreading occurs via frequency hopping at up to 1600 hops per second on 79 channels between 2.402GHz and 2.480 GHz. Bluetooth radio modules avoid interference from other signals by switching to a new frequency after transmitting or receiving a data packet . The sophisticated transmission mode adopted in the Bluetooth specification guarantees protection from interference and tries to ensure data security. Bluetooth operates in the 2.4 GHz range called the ISM (instrumental, scientific and medical) band. This band allows unlicensed operations in the United States, Europe, Japan, and most industrialized countries around the world.