อัปโหลดแล้ว 2 ปี ก่อนหน้านี้
The Cheap Door Supervisor is a non-electric, non-motorized doorbell that allows users to be alerted of visitors at their door, without the need for an expensive, high-maintenance security system. The cheap door supervisor is designed to fit standard door frames and installs easily in seconds. It's simple to use and can be used in any residential or commercial property. The Cheap Door Supervisor is powered by two AA batteries and features an alarm that sounds when the button is pressed, allowing users to hear the doorbell ringing from inside the house.
https://emeraldacademy.org.uk/sia-top-up-door-supervisor/
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