Description Wireless Smoke Detector Home Security Fire Alarm Photoelectric Sensor System 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 RVs Features 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 ㎡ Specification 1 Working Current 1 Static Current 800uA 2 Alarm Current 35mA2 Operation Voltage DC 9V Battery3 Alarm Sound 85dB4 Ambient Temperature 10 C 50 C5 Ambient Humidity 95 RH6 Size 105 x 60mm Package includes 1 x Smoke detector2 x Screws2 x Nuts Details pictures