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Features: 1. Just when the audible (> 52 dB), it will work, then shut down automatically after one minute delay. 2. Automated detect light, it do not sensor when the light is not strong (also adjustable). 3. Non-contact electronic switch, no impact load voltage when connect to the load, extend load life. 4. Sensitivity adjustment (to adjust whatever lighting). Apply to automatic lighting in the corridor, access roads, car parks and basements.