Wireless Bluetooth RF Transceiver Module serial RS232 TTL HC-06 for ArduinoBrief 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 Bluetoothmodule with your systemProduct Feature*****************************************************************************************Size: 37 x 17(L x W)Operating Voltage : 3.3 VOperating Frequency Band : 2.4 GHz unlicensed ISM bandBluetooth Specification : V 2.0 EDROutput Power Class:Class 2Flash Memory Size : 8 Mbit Color:BluePackage included- Bluetooth transceiver module- 4 x female to female jumper wire cable