The CSR Bluecore 04-External single Bluetooth module, also known as the Bluetooth Module (HC-06), is designed for transparent wireless serial connection setups. This Bluetooth SPP (Serial Port Profile) module features an integrated antenna with an edge connector, making it easy to establish connections. By default, it reconnects to the last paired device upon power-up. Compatible with Android mobile Bluetooth, this module operates as a slave device only, providing seamless integration for various wireless communication applications.