ST-350

—— ST-350BT ——
- Wired Mechanical door chime
- Ding Dong sound >80dB
- Power by external transformer 8-12V

—— ST-350D ——
- Wired Mechanical door chime
- Ding Dong sound >80dB
- Power by 220-240V AC 50Hz
- With internal PTC self protection

—— ST-350T ——
- Wired Mechanical door chime
- With build-in transformer 12V/1A
- Ding Dong sound >80dB
- Power by 220-240V AC 50Hz