Feature: 1. The intelligent wireless doorbell adopts advanced wireless transceiver technology, high quality voice processing technology, stable and reliable performance. 2. Doorbell, anti - theft, is a welcome multi - function.Suitable for families, villas, shops, hotels and offices. 3. 32 songs optional, volume level 4 adjustable, a variety of options, up to 30 transmitters can learn and won't lose after power off, support 1527 encoding chip full series accessories. 4. Matching the button, the receiver is in doorbell mode.Just press the button, the doorbell will receive a signal and you will know immediately that someone is coming. 5. When used with infrared motion detector, the receiver appears welcome mode.It is usually for the convenience of the store to remind customers. 6. The transmission distance can reach 150m/492ft in the open air, suitable for home doorbells. 7. Easy to install, simply plug the receiver into a power outlet and connect the transmitter to the door.You don't even have to drill or damage anything. 8. The receiver used with our door sensor is in alarm mode.When the door sensor is triggered, it will wake people up with a loud alarm. Specification: Condition: 100% Brand New Item Type: Doorbell Material: ABS Color: White and Blue Working Voltage: AC 100-220V Working Current: <100 MA Wireless Frequency: 433 MHz Working Temperature: -10 ° C -50 ° C Wireless Distance: Approx.150 M/492ft (Open Space) Transmitter Power Supply: One 12V 23A Battery (Built-In). Package List: 1 x Transmitter1 x Receiver1 x Sticker1 x Manual