$21 off Skylink GM-318 Garage Door Monitor Set

Now you can install a garage door sensor that alerts you to the status of your garage door with audio and visual indicators. Best of all, the Skylink GM-318 Household Garage Door Monitoring System is easy to set up, with the sensor alerting the receiver wirelessly. The garage door sensor mounts near the bottom of your garage door and sends a wireless signal to the receiver in your house when the garage is opened. With its range of 300 feet, you'll be able to place the receiver in any convenient location in your home. The included receiver will control up to four different sensors.

Not included, you can add a Household Motion Alert Sensor or a Household Door/Window Alert Sensor for security, or a Household Water Alert Sensor for water leaks. When multiple sensors are installed, only the corresponding zone LED will flash, so there will be no confusion. In addition, you'll know which zone is being triggered by the number of beeps emitted in succession. If you're planning to leave your garage door open while you work in your garden or on your car, the audible alert can be muted easily.