Photoelectric smoke detectors achieve fire prevention by monitoring smoke concentration， it is a kind of technologically advanced， stable and reliable operation sensor， widely applied to a variety of fire alarm systems， the performance is much superior than gas sensing resistance fire alarms.<br>Features:<br>Heat !#!amp!*! Photoelectric Smoke Detector (battery operated)<br>MCU automatic processing technology to improve product stability<br>Temperature Sensor + Smoke Sensor<br>With mute function<br>Fault self-test function<br>Low battery display<br>Automatic reset function<br>Infrared photoelectric sensor<br>Sound and light alarm / LED indication alarm<br>SMT process technology， strong stability<br>Dust proof， pest control， anti-white light interference design<br>Anti-RFI<br><br>Technical parameters:<br>Operating voltage: 9V battery (included)<br>Alarm sound pressure: 85dB / 3m<br>Operating humidity: 5% to 95% RH<br>Alarm temperature: 57 ° C (135 ° F)<br>Smoke alarm point: 2.06%/ft <br>Alarm indication: red LED flash <br>Detecting area: 20-60 square meters <br>Working temperature: -10 ° C ~ + 70 ° C<br>Sensitivity: 3% / m<br>Product size: Φ128 * 40mm<br>Material: ABS<br>Color: White<br>1 x Detector<br>1 x 9V Battery<br>2 x Screw<br>2 x Bolt<br>1 x English User Manual<br>In Color Box<br /><img src="http://img6.eachbuyer.com/x9/p100/cb412_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cb412_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cb412_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cb412_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cb412_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cb412_6.jpg" />