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Box Contents:1 x Receiver 1 x Doorbell 23 A x12 Volts battery for Doorbell(Already installed) 4 x Wall Plugs 4 x Screws 2×Adhesive backing 1 x Instruction Manual Function Instruction 1. Door Chime Operation Press the push button on the doorbell once, a sounding wireless signal will be sent to the receiver. The sound will stop as soon as the melody ends. For repeated sound, press the button again. Hold the button on, the sound repeat stops. 2. Melody Selection There is a melody selector located at right . Press the selector to change into different melodies. 3. Sound and Flash The receiver received a radio signal, the sound sounded, and the LED light followed the melody. 4. Volume Adjustment Press it to adjust the sound volume to be high, medium and low. Specifications A. Doorbell Power: Plug and play B. Receiver Power: 23A x 12Volts batteries (already installed) Operating Temperature: -30℃ to +40℃ Operating Distance: 300 feet in the open air Selectable Tone: 28 Polyphonic Melodies Digital Code Type: Auto-learning