Plug: US standard Power supply: battery Power supply voltage: AC100-240 (V) Power consumption: 10 (W) Ringtones: 35 LONG WIRELESS RANGE- Adopt FSK+FHSS wireless transmission technology to avoid the other wireless frequency signal interference. the wireless range from the remote push button to the plug-in receiver is up to 1000 feet(actual range will vary depending on the local terrain); the wireless range can go through the doors/walls/floors/and etc. 35 CLASSIC MELODIES OPTIONAL- Up to 35 classic melodies optional,4 levels volume adjustable and LED flash indicator. the kit not only can be used as the doorbell,but also can be used as a panic button for the elders, quiet the classroom for the teacher,train your pets and etc. DIY DESIGN,SUPER EASY TO SET UP- Plug the receiver into a socket and fix the remote push button on anywhere you want with the included accessories(double-sided adhesive tape). the remote push button is rated IP65 weatherproof and acceptable for outdoor use. FULLY EXPANDABLE SYSTEM- the kit includes 1 plug-in receiver and 1 remote push buttons. The kit also can work with HTZSAFE solar wireless driveway alarm systems; expandable up to 32 sensors and unlimited receivers for complete coverage of your property. 35 melodies optional,match different melody with different sensor in your property to differentiate where motion is being detected. Such as the melodies for the front door is Ding Dong,and for the backyard is Jingle Bells