Features 1. Multiple Tunes: 60 music ringtones can be freely switched, with a round and melodious sound. Press the doorbell button, and the receiver will sound and flash. You can choose the perfect music volume that suits your preferences and environment. 2. Strong Signal Penetration: long-distance transmission, strong penetration, strong signal penetration, direct distance from receiving to open space up to 300 meters, suitable for use in office buildings, homes, shops, factories, and other fields. 3. Easy Setup: Simply plug the plug-in doorbell receiver into the socket and use the provided accessories to install the outdoor remote doorbell transmitter on the wall. No need for complex installation or wiring. (The doorbell host uses 3 No. 7 batteries, and the host battery needs to be self prepared) 4. Working Principle: The transmitter is installed outside the door, and the receiver is powered by three No. 7 batteries/Micro UBS power cords. Press the transmitter to ring the bell, and the receiver will immediately sound the bell and receive a lightning reminder. 5. Suitable For: Not only doorbells, but also pagers. Elderly people, children, and pregnant women who have needs can know with just a press, and sleep at night with peace of mind. It can also easily handle various places, such as villas, apartments, office buildings, hotels, nursing homes, and other places. Specification Model: A58-DC Volume: 5-speed volume (adjustable with only flashing lights) Music: 60 pieces of music Receiver: Lights up only when the bell rings Transmitter: Using a 12V23A battery Receiver: powered by 3 No. 7 batteries or Micro UBS power cords Transmitter Size: 77mm x 46mm x 20 mm Receiver Size: 90mm x 56 mm x 23 mm Material: ABS Color: Black, Golden, Silver Size: 9 x 6 x 2 cm Weight: 150 g Package Include: 1x Wireless Doorbell