LaserShield Additional Wireless Detection Unit The LaserShield WDU-0013301 is an additional wireless detection unit to the LaserShield wireless home security system allowing protection of all areas in your home or business. It uses wireless radio signal to communicate with the Master Alarm Unit with a range of 150 feet. Each wireless detection unit an protect up to 1200 square feet. 12 additional wireless detection units can be used to expand the system at any time. The LaserShield system is the first instant plug-and-go home security system and ideal for all homes and businesses. This system requires no setting up or installation at all so will be up and working within a couple of minutes. LaserShield WDU-0013301 Wireless Detection Unit is an additional wireless unit that can be added to the LaserShield basic starter kit. Features: Plug`n`Go Activate In Seconds Immediate Effective Protection Expands to Protect Larger Homes Eliminate Installation and Programming Packaging: Retail Box What’s in the kit: Provided in the kit is: 1 x Wireless detection unit 1 x AC Power Adapter Window Decals Built-in backup battery Pet shield Requires LaserShield Basic Starter Kit for use