LaserShield WDU-0013301 Wireless Detection Unin
With additional LaseShield wireless detection units you can protect all areas in your home and business. The wireless detection units communicate with the Master Alarm Unit via wireless radio signals and have a range of 150-Feet (without obstructions). Each Wireless Detection Unit protects up to 1200 Square-Feet. 12 Wireless detection Units can be added to expand the system at any time.