Wireless Driveway Alarm System / Perimeter Alarms. Driveway Alert Systems - Buy Online. Wireless, solar recharging, infrared security beam, …
常见问题解答
问:
If the beam is solar powered, how does it work at night?
答:
The security beam emitter and transmitter are each powered by a long life nickel-metal hydride battery pack which is constantly re-charged by the attached solar panel during the day...
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