1. Operating range up to 200meters

2. With LED indicator for both push button and receiver

3. Grade volume adjusting from 0dB~110dB

4. IP65 waterproof design for push button

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

6. Optional color : Black and white

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

8. Push button use 1pcs 12V/23A battery or CR2032 battery