Home Wireless Remote Control Doorbell 36 Music Doorbells Features: Working voltage: 110-240V Working current: 120mA Power: 2W Music: 36 cord music for option Sound: 25-80dB (4 grade volumes) Remote control distance: 100m (in open air) Work frequency: 315MHz Transmitter: Work voltage: 12V (Battery Model: 23A 12V, not included) PS: If you buy with battery, then we send you the battery inside the transmitter. Work current: 15mA(20 times a day by calculating, a high quality) LED indicator: press the send button, LED indicator light will flash, emitter work and the receiver receive 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 Temperature: -10 -50 Deg.C Specifications: Plug type: EU, US Material: ABS Receiver: 9.5 * 6 * 3.4cm Transmitter: 8.4 * 6 * 2.3cm Waterproof: YES Only sell the doorbell in the picture, the rest of the goods are for reference only and not for sale