Bluetooth Shield for Arduino ( unassembled ) Up to10m communication distance in house without obstacle Arduino/Seeeduino compatible On board PCB antenna . The units arrive with instructions on how to solder & assemble the units before they may be used. Default baud rate: 38400, data bits: 8, stop bit: 1, Parity: No parity UART interface (TTL) with programmable baud rate (SPP firmware installed)