... sitting room, study and dinner room, kindergarten, classroom, office, car, restaurant, and other public places. ¨ Specifications Gas detection Highly ... air-purifier, max current 3A resistance(220VAC) Warning alarm Inner buzzer alarm and also three colors backlit switch as well Buzzer ... Power supply 24VAC/VDC,230VAC Consumption 2.8 W Quality System ISO 9001 Housing PC/ABS fire-proof, IP30 protection ...