 Introducing the Geo-CTR Wireless Recessed Door Window Contact for the Geo Alarm. With 600 to 780 feet line-of-sight open air range, easy open and closing for enrollment into the Geo Alarm, cover tamper and 60-minute supervision, powered by a CR2032 battery with 8 years of life expectancy, IPX4 resistance rating, 2.49 x 1.31 x 0.48 inch dimensions, this device will operate in temperatures from 32 degrees to 120 degrees Fahrenheit. Once again introducing the Geo-CTR Wireless Recessed Door Window Contact for the Geo Alarm.