Product Review

Aideepen HC-05 Bluetooth Module (Master/Slave) provides a wireless communication link between your Arduino and any bluetooth capable device

Specification:
Working voltage: 3.3 V
Working current: matching for 30mA, matching the communication for 8mA
Wiring(only need 4 wires): RX to RXD / TX to TXD / GND to GND / 3.6V to 6V

Package Included:
2 x HC-05 Bluetooth Modules