Prevent burglars from sneaking in late at night or when you're not home. The 95dB Entrance Alert is a magnetic door alarm that emits a loud, 95dB alarm when the door is opened, sounding the alarm for 45 seconds before resetting automatically, ample time to frighten away even the bravest burglar. It can also be used on windows or sliding glass doors. You'll appreciate the added security this door alarm provides. The 95dB Entrance Alert installs easily using the included mounting tape. Just slide the switch to the ON position for instant security. The battery is pre-installed. A 95dB Window Alert is also available. This glass-break sensor will alert you if anyone tries to tamper with your windows. If you prefer a motion detector-triggered alarm, the 105dB Motion Alert with Keypad acts as a programmable burglar alarm that has a built-in motion sensor that triggers the extra-loud alarm when someone passes through it.