LiftMaster 312HM Universal Coaxial Receiver with Security+ 315MHz

External 8" whip antenna included. Security+ rolling code and/or DIP switch compatibility, 12VDC or 18 - 35VAC/DC jumper selectable. Momentary or constant contact, jumper selection. 2-piece aluminum case with detachable cover. High security memory stores up to 15 Security+ remote control or keyless entry codes. Normal security memory stores up to 31 LiftMaster remote control codes of any type. FCC certified 315MHz. Warranty:3-years.