School Electric Bell with Outside Peen
Specifications
Voltage and color can be custom
1) Alarm of easy combustion causticity air or conductive dust
2) The surrounding temperature does not exceed 40° C
3) Bear to press: 1, 500V, 50 times/a minute
4) Electric resistance: Shouldn't be small than 10
5) Settle the electric voltage ± 10%
6) Switch every 5 minutes
7) Work time: Not longer than 5 minutes
8) Uninstall the bell cover to move absolutely
Audited Supplier 
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