1. No battery required for push button

2. Plug in receiver with 110V~220V voltage

3. Operating range up to 200meters

4.  With LED indicator for both push button and receiver

5.  5 Grade volume adjusting from 0dB~110dB

6.  IP65 waterproof design for push button

7.  DIY code : easy to add more push bells and Chimes

8.  Optional color : Black and white