Good quality 220/12v ding dong door bell hotel doorbell

Features:
1, the hotel popular standard Ding Dong
2. Use a wired control, 220V AC power supply, regardless of the positive and negative
3, the appearance of high-end ultra-thin appearance
Technical Parameters
Type: jingle bell / music doorbell;
color: white
Material: PC fuel resistance
Size: 86 * 86mm
Operating voltage: 220V or 12V, 4.5V, 3V;

Humidity: 0 ~ 90%;
Working temperature: -10% to 50% degree;
Extensions: can be matched with the major brands customer control host.
feature of product:
Continuous 10-15 times will be into self-protection function, one minute after the resumption of use