Heddolf 318 Mhz Garage Door Opener Remote Transmitter for Allister Allstar Pulsar Challenger Heddolf garage door opener remote control transmitter model 0220-318 Replaces Pulsar or Allister brand units 1 Button single channel remote transmitter 318 MHZ Frequency gate or garage door opener Nine (9) 3-positions (trinary) dip switch format