1 Remove the cover or body. The sensing chamber a loud horn and a battery and in some cases house voltage power source. Standalone Photoelectric Smoke Alarm Fire Smoke Detector Sensor Home Security System For Home Kitchen 9v Home Security Systems Home Security Smoke Alarms Most smoke detectors are removed by twisting or sliding the detector away from the mounting. How to open smoke detector . Unlock the battery drawer To unlock the batteries insert a flathead screwdriver under the head of the locking pin and gently pry it out of the battery compartment lock. These models require that. You may need to remove the device first or just slide away from the battery compartment cover. Inside you will find three main parts. How to open a smoke alarm. Some detectors will not require you remove the entire detector. Observe the whole room manually. All smoke detectors have a test button sometimes it is the only button on the face of the detector. To access this suck it must ...