ST-3248

—— ST-3248B ——
- Wired Mechanical door chime
- Ding Dong sound >80dB
- Power by 4pcs C size battery or external transformer 8-12V

—— ST-3248D ——
- Wired Mechanical door chime
- Ding Dong sound >80dB
- Power by 220-240V AC 50Hz
- With internal PTC self protection

—— ST-3248T ——
- Wired Mechanical door chime
- With build-in transformer 8V/1A
- Ding Dong sound >80dB
- Power by 220-240V AC 50Hz