A product for Arduino that works with official Arduino boards. This bluetooth shield master-slave integration module can be easily used with Arduino for transparent wireless serial communication. You can choose two pins from Arduino D0 to D7 as software serial ports to communicate with bluetooth shield (D0 and D1 is hardware serial port). The shield also has two Puzzle connectors (one is digital the other is analog) for you to install Puzzle modules. - Can automatically recognise level suitable for 3.3V 5V; - Onboard IIC / I2C socket and digital port; - ESD protection; - With power and state indicator; - Supports any software serial port or any hardware serial port; - Input Voltage: 3.3V; - Baudrate: 9600 19200 38400 57600 115200 230400 460800; - Seeeduino / Arduino compatible; - Up to 10m communication distance in house without obstacle; - UART interface (TTL) with programmable baud rate (SPP firmware installed); - Default Baud rate: 38400 Data bits: 8 Stop bit: 1 Parity: No parity; - Default PINCODE: "1234"; - A full set of configuration commands; - On board PCB Antenna; - FCC Part 15 Certificated.