Bluetooth is a short range wireless technology that uses low power radio waves to transmit information/signals over short distance between two electronic devices.
The Bluetooth technology can be use to send files, control electronic devices within a distance 10 meters.
Electronic devices like smartphones, earphones, MP3 players, smartphone controlled fan and many other IOT devices that are controlled wirelessly.
Bluetooth technology is a high-speed low powered wireless technology link that is designed to connect phones or other portable equipments together.
It is a specification (IEEE 802.15.1) for the use of low-power radio communications to link phones, computers, and other network devices over short distances without wires. It is achieved by embedded low-cost transceivers into the electronic devices like IOT electronics, laptops, printer etc.
It supports the frequency band of 2.45GHz and can support upto 721KBps along with three voice channels. This frequency band has been set aside by international agreement for the use of industrial, scientific, and medical devices (ISM). rd-compatible with 1.0 devices.
How bluetooth is transmitted and received.
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Wi-Tricity & Telecom