Honeywells FG8MS wireless glass break sensor is the perfect inner perimeter protection solution to address the problem of false alarms, particularly common in environments where there is a lot of glass present, for instance on retail sites. Honeywell unique patented bi-directional secure 868 mhz wireless technology - longer range (1000m) and improved battery performance. Fast fit and simple setup: ready to go out of the box with screw-free install. Low battery indication. Wireless and easy to install. Range 1000m. 868MHz. Fully expandable system - up to . Pack includes: Batteries; fixings and installation DVD. Batteries required: 2 x (included), . Size H12.7, W7.7, D2.4cm. Weight 143g. Manufacturers 2 year guarantee.