1/4pcs Door Window Alarm Wireless Electronic Intrusion Alarm Home Burglary Magnetic Security System Features 1. Door and window alarms can reduce the loss when the incident occurs, let you spend less money, and achieve the effect of protection and deterrence. With the frequent occurrence of economic downturn and social cases, how to protect the safety of oneself and living has become an important issue. It is not enough to rely on an effective police force. Prevention is better than remedy after the fact. Door and window alarms are your home security guards. 2. This product is easy to install, just stick the main and auxiliary parts on the door and door frame, or two windows, and align them (leave a gap of about 0-1 cm). When someone illegally opens the door or window (the relative position of the main and auxiliary parts changes), the alarm can emit a strong alarm sound to warn the intruder to leave. When you want to open the door or window, you can turn off the switch. It is suitable for anti-theft in residential houses, offices, shop counters, etc. 3. Produce a single blister + paper card packaging. Use two AA batteries (battery not included) Specifications Package Include:1/4pcs * Door Alarm Note: Due to different personal measurement methods, there will be an error of 2-4 cm, please understand Thanks for your support