Free shipping over HK$1,500 in Hong Kong
Invisible Open Sensor
$119
To secure windows, doors or skylights: The door/window contact installs invisibly and detects open doors and windows.
When you leave the house, you switch to alarm mode. That means the system sends a message to your smartphone or tablet as soon as a door or window is opened. The contact is easy to install and can be removed without trace.
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