1. Size: 107*35mm2. The shell is made of ABS fire-proof material and its sensitivity meets UL217 standard.3. Working Voltage: DC9V 1*6F22 Battery4. Alarm mode: acousto-optic alarm5. 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 Specification: Package Weight One Package Weight 0.12kgs / 0.26lb One Package Size 10.7cm * 3.5cm * 5cm / 4.21inch * 1.38inch * 1.97inch

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