Please note, this item ships from an international seller. Expected delivery is 10-15 days. product features: Color: black, white material: plastic Size: receiver 95 * 65 * 24mm transmitter 75 * 51 * 20mm Music selection: 60 songs Volume selection: 5 levels Working range: 300M Voltage range: 110-220V Receiver: AC 110-240V receiver directly plugged into power Transmitter: 12V 23A (requires 1 12V 23A battery. Product does not contain!) Simple installation: Just connect the receiver to the socket and attach the transmitter to the outer wall with the provided screws or tape. Play mode: Music selection settings: Touch the song selection key Loop playback mode: Long press the song selection button for 3 seconds, and hear "Didi" enter the loop state. At this time, every time you press the transmitter, the doorbell song will change one song. Scope of application: family and commercial residential areas, office buildings, hospitals, restaurants, factories and other places Products include: 1 * doorbell receiver 1 * Doorbell transmitter (without battery) 1 x double-sided tape 1 sticker 2 screws 1 x description wirelessdoorbellbutton wirelessdoorbell led