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|If you are buying a single security product to protect windows, a glass break detector may be more affordable, because it can protect several windows at once.
An alternative is a magnetic window switch, which protects one window per sensor. It senses movement as the window opens, and sends a signal to activate your house alarm. If you have several windows to protect, your costs can add up with window switches.
For the best protection, you may want to consider a combination of window-break detectors and window switches, also known as window sensors.