Wireless Infrared Alarm System Alarm Bell Greeter, Anti-theft Alarm(2 Pack)
$35.99
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This item is without battery.Doorbell mode: Sensing opportunity to shoot a secondary issue "DING-DONG" sound, while LED lights.Alarm mode induction machine issues an alarm sound for about 20 seconds, while the LED lights up (to complete a trigger, shall after about 3 seconds to respond to the next trigger)9V Square battery(Alkaline battery)
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