General description Replacement Garage Door Remote Control for Sommer 4020 TX03 868-4 is designed to provide reliable access to your garage with a rolling code system. This remote control operates at a frequency of 868 MHz and is sold in a convenient 2-pack. Technical specifications Frequency: 868.8 MHz (Rolling Code) Buttons: 4 Coding: Radio Compatibility and accessories Compatible with: Sommer TX03 868-4, 4020V000, 4025V000, 4026V000, 4031V000, 4011V000, 4035V002 Not compatible with: Pearl, Pearl Vibe, Pearl Twin or other models of the same frequency Installation Access to receiver required for programming Programming can be done with receiver, motor, or door opener