Sears Craftsman LiftMaster Chamberlain High Memory Universal Coaxial Gate Receiver 312HM 315mhz receiver for 2005 garage door openers and later Features Security+ 4 wire connection, plus 8" external whip antenna Includes Receiver, Antenna, Wire and Instructions will work on 12 volt DC or 18 - 35 volts AC/DC, jumper selectable