Features1. Excellent Working Range: Our wireless door chime working range up to to 500 ft. Far enough to cover every door and window in your house.2. 50 Music with 4 Volume Levels: Our door entry alert has 4 levels of adjustable volume. 50 unique chimes allow your wireless door and window entry alert system to meet any need.3. Easy Installation: Plug the receiver into any standard outlet. Tear the double-sided tape and stick the sensors to the door or window. The receiver will alert immediately when the sensors separated.4. Reminder Function: If your door or window is left open. The receiver will ring every 5 minutes, auto-silence after 5 times. You can turn off this function if you don't need it.5. Expandable Wireless Door Chime: You can add more receivers and sensors in multiple areas. Each wireless doorbell receiver can pair up to 50 sensors and each sensor can add unlimited receivers.SpecificationMaterial: PlasticColor: WhiteSize: 8 x 8 cmWeight: 80 gPlug Type: US, UK, EUPackage Include:1x Wireless Door Chime