... hearing handicapped.Features 36 music tunes for you to choose. Doorbell powered by: 2x AA battery(not included) Remote powered by ... : 1x 12V 23A alkaline battery (included) Dimensions: doorbell unit 100 mm x 68 mm x 25 mm; remote ... sticker 1 x 12V 23A alkaline batteryDescriptionIntelligent digital remote control doorbell,ideal for homes,offices,guest rooms,hotels,hospitals and etc ...