5Pcs HC-06 Wireless bluetooth Transceiver RF Main Module SerialDescription: Note: This module does not suitable for IOS system. The core module HC 06 main modules, leads the interface includes VCC, GND, TXD, RXD, KEY pin high trigger to clear the pairing information re searchled indicate bluetooth connection status, flash unpaired slow flash indicates paired but not slave connection, Always follow machine connectedBackplate settings LDO input voltage of 3. 6~~6V unpaired current is about 30mA, paired 10mA, input