Door and Window Alarm Window Anti-theft Alarm Door Sensor Alarm Specifications: Main part: 92MM 31MM 18MM Secondary part: 50MM14MM 13MM Power supply mode: two AA batteries (not included in the package) (the normal use time of big brand batteries is about 2-8 months) Function: The thief pushes the door and window to cause the main and auxiliary parts to separate and trigger the alarm Scope of use: 1. Wide range of places such as doors, windows, homes, shops, businesses, etc. 2. Internet cafe computer case anti-theft device This product is easy to install, just stick the main and auxiliary parts to the case cover and case, or two windows, and align them (leave a gap of about 5 mm). When someone illegally hits the case or window (the main and auxiliary parts are separated), the alarm The device can send a strong alarm sound to warn the intruder to leave. When you want to open the door and window, it can be controlled by the switch. It is suitable for anti-theft in Internet cafes, residential houses, offices, store counters, etc. Built-in 90db alarm output! Notice: Due to light and screen differences, the color of the item may be slightly different from the picture. Please allow 0.5-2cm difference due to manual measurement. Thanks for your understanding. Delivery Quantity: 1