HC-06 Wireless Bluetooth Transceiver Module - TOOGOO(R) 2 x Arduino JY-MCU HC-06 Wireless Bluetooth Serial RF 5V Transceiver Module 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 search. led indicate Bluetooth connection status, flash unpaired slow flash indicates paired but not slave connection, Always follow machine connected. Backplane settings LDO input voltage of 3.6~~6V unpaired current is about 30mA, paired 10mA, input voltage prohibit more than 7V absolute prohibition of reverse power! Interface level 3.3V, can be directly connected the various SCM (51, AVR, PIC, ARM, MSP430, etc.), the 5V MCU also can be connected directly, without MAX232 can not go through the MAX232! Open to effective distance of 10 meters, over 10 meters is also possible, but not of this the quality of the connection of the distance do to ensure.