This product was replaced by an updated version Bluetooth Shield V2.0 The Blueseeed TH Shield (HM01) integrates a Serial Bluetooth module. It can be easily used with Arduino/Seeedstudio for transparent wireless serial communication. Features: Seeeduino/Arduino compatible Up to10m communication distance in house without obstacle UART interface (TTL) with programmable baud rate A full set of configuration commands On board PCB Antenna Specification: Power supply Voltage: 3.3V Baudrate: 9600, 19200, 38400, 57600, 115200, 230400, 460800 Default Baud rate: 9600, Data bits: 8, Stop bit: 1, Parity: No parity Default PINCODE:”1234” Bluetooth version: v2.1+EDR