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Wireless Doorbell Smart Home Welcome Smart Door bell 300M Long Wireless Distance Remote Control 60 Songs Home Electronic Pager Scope of work: 300M Music selection: 60 songs (factory default ding dong ding dong) Power supply voltage: The receiver supports AC100-240V voltage Communication doorbell: The transmitter uses a 12V23A battery, and the receiver is directly pled in Play mode: Music selection settings: Tap the song selection button Loop insertion mode: Long press the song selection button for 3 seconds and hear two beeps to enter the loop state. At this time, every time the transmitter is pressed, the song on the doorbell will change one song Scope opplication: Home commercial ial areas, office buildings, hospitals, restaurants, factories and other places.