Wireless Bluetooth RF Transceiver Module serial RS232 TTL HC-06 for Arduino Brief Introduction- Support Master and Slave mode, modify by AT commander- This Module can easily transfer the UART data through the wireless Bluetooth- Without complex PCB layout or deep knowledge in the Bluetooth software stack- You can combine this, Bluetooth module with your system Product Feature Size: 37 x 17(L x W) Operating Voltage: 3.3 V Operating Frequency Band: 2.4 GHz unlicensed ISM band Bluetooth Specification: V 2.0 EDR Output Power Class: Class 2 Flash Memory Size: 8 Mbit Color: Blue Package included- Bluetooth transceiver module- 4 x female to female jumper wire cable.