100M Bluetooth Module WKBT0221AR Class 1 USB, UART, SPI, PCM interface Bluetooth Profiles: HFP, HSP, A2DP 100M Bluetooth Module WKBT0221AR z Fully ... Low Power Consumptionz Excellent Compatibility with Cellular Telephonesz Integrated 1.8V Regulatorz USB and UART Port to 3MBaud z ... 2.2 (mm)UART InterfaceTX,RX, RTS, CTS(9600bps~1.5Mbps) SPI InterfaceSynchronous Serial Interface for firmware download USB ...