Feature:1. Flexible design, easy to install, no need wiring, save money and effort, free to move installation location.2. Using the most stable music chip, 36 chord bell, pleasant to hear.3. Loud sound, 150 range can be heard, 8 levels of volume can be adjusted, to meet the needs of different environments.4. Doorbell host and doorbell button can be wireless code, high receiving sensitivity, long distance, stable wireless signal, suitable for the general family and yard.5. The doorbell has power off memory function, it will remember the volume and selected music before power off, do not worry about information loss.6. Anti-interference design to avoid interference between users.7. LED battery indicator, timely remind to replace the battery.8. Integrated stereo speaker, widely used, suitable for office buildings, homes, factories, tourism and other places.Specification:Condition: 100% NewItem Type: Wireless DoorbellMaterial: ABS PlasticColor: As Pictures ShownStandby Power Consumption: 0.5wAlarm Current: 5wWireless Frequency: 433mHzEncoding: 1527/330KPower Supply Mode of Transmitter: 1 x Alkaline Battery, DC12v 23A (Built-in)Working Distance: Approx. 100m/328.1ft (Open Space)Applicable Temperature: -20-+55Applicable Humidity: 40%-80%RH.Package List:1 x Receiver1 x Transmitter1 x Adhesive Tape1 x Manual