The product can be installed directly to door or window, as soon as there is someone unwanted to open door or window, it will start to alarm and can draw you attention.

How to install:
1. Put into the cell battery in the right place; To fix the main master machine on the door or the window

2. Glue the magnetic iron parallels on frame or the window frame sticks the plastic cloth in advance in the center, longest distance 8mm. The way to draw your attention;

3. When switch to "on", door or window to send out the invoice, When the voice turn down, please change the battery; When switch "OFF", it stops.

——It is easy to assembly, tools not needed.

——Magnetic transmitter.

——Had he strong ability to make strong voice to the police.

——Low consumption

——Supply three appliance to the police has the 1.5V LR44 botton battery in the general commerical