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Product Name: Wireless Doorbell, Pager Material: Native ABC resin Music Selection: 52 Ringtones Volume selection: 4 volume adjustable size Working range: 300M (empty mining area) Operating voltage: AC 110V-240V, DC 1.5V AAA battery*3 Wireless frequency: 433.92MHz Working temperature: -10°C-55°C Transmitter power supply: 12V 23A 1 alkaline battery Volume: 65-110dB Use range: home business residential area, office building, hospital, restaurant, factory and other places How to use: insert the receiver and press the button