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No need external power supply, connect to wired alarm control panel GND and NC ports directly which make signal stability and no trouble for the battery;
Operating distance: more than 15mm, less than 25mm;
Item need be work with your alarm system, it can not be self-employment;
White color make home great and beautiful.
Wired magnetic door/windows contact can be added to wireless/wired Alarm Systems.(some wireless system has wired zones).They are best for protecting doors, windows and any other other you want to protect.
Economic solution for Non-metal door/window protection;
No external power supply, connect to wired or wireless alarm control panel GND and N.C or N.O ports directly!
Alarm distance: 15mm-30mm
Mbangde Lot of 6 Wired Magnetic Door Contact Personal Alarm Gap Window Door Sensor for Home Security Alarm System DIY Kit - B01M8JCGSO