This BC04 Bluetooth module based on British CSR Blue Core4-Ext chip,follow v2.1 +EDR Bluetooth specification. The module supports UART,USB,SPI ,PCM SPDIF interface and support for the SPI Bluetooth serial protocol, low cost, small size, low power consumption,send and receive sensitivity advantages,just with a few external components will be able to achieve its powerful. -This BC04 Bluetooth module based on British CSR Blue Core4-Ext chip,follow v2.1 +EDR Bluetooth specification. The module supports UART,USB,SPI ,PCM SPDIF interface and support for the SPI Bluetooth serial protocol, low cost, small size, low power consumption,send and receive sensitivity　advantages,just with a few external components will be able to achieve its powerful.