Description HC 05 could be setted to master or slave by user HC 06 can only be master or slave which could be customized Wiring only need 4 wires RX to RXD TX to TXD GND to GND 3 6V to 6VPower 3 3VNote This module does not suitable for IOS system Package included 1 x HC 05 wireless bluetooth serial transceiver module