Bluetooth Low Energy (LE) is a wireless protocol transmitting at 2.4 GHz. It's designed and promoted by the Bluetooth SIG. Bluetooth LE is separate to and not compatible with the previous 'Classic' Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) protocol. Unlike Classic Bluetooth, devices do not have to pair. The Bluetooth 4.0 and Bluetooth 5.0 specifications allow devices to implement both LE and Classic protocols on the same device.

The main features of Bluetooth LE are:

• Standards based for inter-operability
• Works with all popular operating systems including iOS, Android, macOS, Linux and Windows
• Very low power and able to operate on battery power for years
• Commodity rather than proprietary devices so lower cost than, for example, ultra wideband (UWB)
• Multi-channel, short advertising, not CSMA, for good performance in noisy environments

This site is an unofficial directory of Bluetooth LE specifications, information, hardware products and programming information. If you are new to Bluetooth LE, read the overview. Otherwise, pick a topic from the sidebar.

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