... alarm. 4.This sequence tests the units electronics, battery and horn to ensure proper operation.5.The unit shall include ... power.Wide ApplicabilityApplies widely to works, banks, stores, warehouses, offices and homestead etc. Technical Parameter: Main unitParameterOperating VoltageDC9VStatic Currentless than 10 ... Remain7-15 days Wireless optic smoke detector wireless with home and commercial security