The photoelectric detector detects the smoke by a couple of infrared diodes.<br />The principle of detecting is granule in the smoke can reflect infrared light.<br />Infrared diodes are placed in the special chamber.<br />The chamber can shield external light｣ｬbut don't affect the smoke into it.<br />While have no smoke｣ｬthe diode can receive very weak infrared light.<br /><br />Features:<br />*Test by hand.<br />*Auto reset.<br />*Asic adopted.<br />*Anti-light.<br />*Strong adaptability circumstance.<br />*SMT design｣ｬHigh stability.<br />*All-round  detection angle<br />*Suitable for Home｣ｬ Office｣ｬ Hotel｣ｬ etc.<br /><br />Specifications:<br />Product Name: photoelectronic smoke detector<br />Operating voltage: DC 9V (6F22 battery)<br />Wireless transmission distance: ｡・50m<br />Static current: ｡・0uA<br />Alarm current: ｡・0mA<br />Indicate alarm: Red LED Flash<br />Sound level: ｡・5dB/m(independence or wireless type)<br />Low pressure alarm: 6.8V<br />Operating temperature: -10｡~+60｡<br />Operating humidity: ｡・5%RH<br />Detecting Area: 60 square meter<br />Installation height: ｡・m<br />Alarm Output: sound&amp;amp;flash alarm<br />Size: 113x38mm<br />Color: White<br />Weight: 142g<br />Execute Criterion: EN14604-2005/GB4715-2005<br /><br />Package Included:<br />1x Photoelectronic smoke detector (with accessories)<br />1x Manual for photoelectronic smoke detector<br />2x Expansion Plugs<br />2x Screw