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Motion Sensor Alarm Siren 120dB Security Horn 12 Tone Adjustable Motion Detector Strobe Light for Home School Factory Farmer Warehouse Dock Home AC110V-120V 【Motion Sensor Strobe Siren】The alarm uses motion sensor, stand by after power-on, trigger an alarm when human or animal movement is detected within a range of 3.2-32 feet. Stop the power supply, the alarm siren stop working...