Product description: 1: AC terminal (pin): round plug (European standard)2: Receiver working voltage: 220V, working current 120mV (at 220V), quiescent current 120mA (at 220V)3: Power: 2W4: Music: 36 chord music to choose from5: Working frequency: 315MHZ6: Controllable volume: 25-80dB (4 levels of volume adjustment options)7: Remote control/receiving distance 100m (open area)8: Transmitter working frequency: 315MHZ9: Transmitter working voltage: 12V (battery model: 23A 12V)10: Transmitter working current15mA (calculated by 20 times per day, a high-quality battery can be used for one year)11: LED indicator: press the launch button, the LED indicator of the transmitter is on, the transmitter is working, and the receiver receives the instruction, and also sends out beautiful music to remind you that there are VIPs visiting, and the LED light on the receiver is also It flickers regularly with music12: This doorbell has an anti-seepage function, which can meet the requirements of customers to place the outer door; 12) Temperature resistance: -10~50