Bluetooth module board Series * With LED indicator light, use 150mA and 3.3V regulation chip * With VCC、GND、TXD、RXD foot for the Bluetooth * With "Re-seach" button(ON/OFF/WAKE foot for it , external MCU outinput "High level" can control module to re-seach) * Compatible with bluetooth master module", slave module"or master-slave(whole) module.