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How to install window sensors in your home
Choose which windows in your home you want to make part of your home security system.
Buy one sensor for each, after confirming that a particular kind of sensor is compatible with your burglar alarm system.
You don't need to cover all your windows.
Windows that are plainly visible from the street, and windows up off the ground floor, usually don't need a sensor. Neither do windows that are too small for a burglar to fit through.