The future of residential home security and home management is now. Offer your customers the latest and most advanced security and home management solution in the industry. Compact in size, only 2-1/2 in. long with a fully supervised Lithium battery of 5 years life, it also features reed sensitivity of 0.625 in. (1.59 cm) minimum gap, 0.85 in. (2.16 cm) typical.