First Alert Battery-Operated Fire Smoke Alarm Detector(White)

1. Size: 107*35mm 2. The shell is made of ABS fire-proof material and its sensitivity meets UL217 standard. 3. Working Voltage: DC9V 1*6F22 Battery 4. Alarm mode: acousto-optic alarm 5. Suitable for indoor families dance halls warehouses etc. Test methods: 1. Button test method. Press the test button on the smoke sensor directly. After a few seconds the alarm will be sent out directly. 2. Smoke test. Smoke is sprayed through the hole of the smoke sensor. Smoke should not be too thin. After a while the light on the smoke sensor will start to flicker and after a while an alarm will be issued