HomeSafe Remote Control Radio Frequency Remote control unit to activate the Homesafe Alarm System. Includes Lithium battery. Range up to 30 meters, 20 meters is average performance. Compatible with several main units, 605AR, T015S, T016S, T018S, T068S, 639S, 820, 526F, 526L, and 625R. See manual to allow remote to learn code operation. Replace battery every 6 months. Uses CR2032.