ST-89

——ST-89B——
- Wired Electronic DC door chime
- 12 pcs high quality melodies
- 2 level sound volume control 70dB / 80dB
- Power by 4pcs AA/LR6 battery

——ST-89D——
- Wired Electronic AC door chime
- 12 pcs high quality melodies
- 2 level sound volume control 70dB / 80dB
- Power by 220V-240V AC