Skylink GM-434RTL Long Range Household Alert & Alarm Home Security Safety Protection Garage Door Monitor System Kit

Great for larger homes, the Skylink GM-434RTL Long Range Garage Door Monitor lets you monitor multiple access points from a large distance. Makes sure you're not surprised should your garage door open in the middle of the night. The main unit can monitor up to four separate zones at once and can be paired with up to 16 sensors (only one sensor is included; additional units available separately). A supervised-sensor feature also monitors the battery condition of the sensors. When the garage door has been left open, the main unit alerts you with a piercing 95dB siren and sets off flashing lights. The sensor comes with a long-lasting 3V lithium battery. Overall dimensions: 6.25L x 4W x 1H inches. 2-piece alert system for your garage door. Visual and audio indicators for maximum alertness. Operational range: up to 800 feet. Manufacturer's 1-year warranty.