... 2.dustproof meshwork 3.SMT design,high stability 4.infrared photoelectronic sensor DC 12V alarm of fire1.TECHNICAL SPECIFICATION•OPERATING VOLTAGE ... Indicator on signifies detector alarming.Built-in a couple of output contact,which keep close when work normally and ... •ANTI-LIGHT,MOTHPROOF,DUSTPROOF•STRONG ADAPTABILITY FOR CIRCUMSTANCE•SMT DESIGN,HIGH STABILITY•STAIN STEELESS SHIELD,ANTI-RFI(20V/m- ...