Heddolf Garage Door Opener Remote Control Transmitter 0220-1KB/340 340mhZ Frequency Only Single button visor mount garage door opener remote control. Compatible with Crusader, Over Head Door Garage Door Openers using the 340 MHZ Frequency. 9 -3 position (+/o/-) code switch setting. Battery, visor clip, and coding instructions included. Size: 1 3/8" x 2 3/4".