85-decibel alarm， A perfect item for protecting your family from the dangers of fire and smoke.It can be mounted on either the ceiling or the wall and can be used in mobile homes and RVsFeatures：1.Easy installation2.Battery-operated smoke alarm with photoelectric sensor3.The built-in special IC， stable performance， high sensitivity;4.The optical principle smoke measure the room，can accurate detection or fire from the early smoke5.Can simulate alarm test for alarm;6.Voltage alarm function，when the battery voltage is lower than 7.5V，issued a prompt remind users change the battery;7.Alarm loudness:loudness is equal or greater than 85DB;8.Working temperature range;-10℃-+50 ℃9.Protection area: height 12 m/80 ㎡Specifications:1. Working Current: 1-Static Current: ≤800uA 2-Alarm Current: ≤ ≤35mA2. Operation Voltage: DC 9V Battery（INCLUDED)3. Alarm Sound: ≥ 85dB4. Ambient Temperature: -10° Cˉ 50° C5. Ambient Humidity: ≤ 95%RH6.Size: Φ105X60mmPackage included:1x Smoke detector2x screws2x nuts