First, the scope of
This product is the Bell, suitable for industrial and mining enterprises, government agencies and organizations, public schools and equipment supporting the AC 50HZ, voltage to 220V circuit, make a call or alert, also applies to the family as the doorbell, alarm and more.

Second, normal working conditions:

1. altitude is not more than 2000 m

2. medium humidity not higher than + 40 degrees or below-25 degrees air temperature not more than 90% (when the temperature is at + 25 degrees)

3. in the air around them without flammable and corrosive gases or conductive dust and no significant shake and shock and vibration environments.

4. can work at rated voltage ± 10%, not more than 10 minutes of continuous service.

5. pollution grade 2, installation category II of the categories.