Bluetooth transmitters send and receive data via radio frequencies between the 2.4 and 2.485 GHz range. A device must be outfitted with Bluetooth technology to receive or send information with another Bluetooth-enabled device.
Bluetooth was invented in 1994 by engineers at the Swedish Ericsson company. It was intended as a way of providing a safe, secure means of transmitting data without having to rely on wires. Bluetooth is not owned by any particular group, so any manufacturer can enable their devices for the technology, as long as they meet Bluetooth Special Interest Group specifications. The Bluetooth SIG is composed of a group of companies that work to promote the technology.
Bluetooth transmitters and receivers get their power from the device they are plugged into or installed in. They send and receive data through radio, as opposed to infrared or other wireless transmission technologies. It operates on an unlicensed band of the radio spectrum dedicated to industrial, scientific and medial use. It can also hop between frequencies automatically to avoid interference from other devices. Devices can connect automatically when they come into range with another device that it recognizes. Most Bluetooth devices have a range of up to 30 feet, but manufacturers can set their devices to send and receive over a much longer range.