Working voltage of the receiver: DC 4.5V (3 x AAA) working current: </=80mA; Static current: </=0.8mA (ultra-low power can extend battery life); Power: </=2W; Music: 36 cord music for option; Sound: 25~80dB ( 4 grad volumes); Remote control /receiving distance: 100m(in open air); Work frequency: 315MHz; Work voltage of the emitter: 12V (battery model: 23A 12V); Work current of the emitter: </=15mA(calculated by 20 times a day); LED Indicator: press the sending button LED indicator light will flash emitter work and the receiver receives the order and then send out the beautiful music reminded you the VIP visit the blue-ray LED of the receiver will regular flash along with the music; water-resistant; Can be put outside the door; Temperature: -10~50'C