How to use:
This product is easy to install. Simply attach the main and auxiliary parts to the
door and door frame,
or the two windows, and align them (leave a gap of about 5 mm).
When someone illegally opens the door
or window (the relative position of the main and auxiliary parts changes),
the alarm can sound a strong
alarm to warn the intruder to leave. When you want to open the door or window,
you can control it by the switch.
It is suitable for theft prevention of residential houses,