describe Compatible with Sommer TX03 868-4 4020 868 MHz transmitter. Not compatible with Pearl, Pearl Vibe, Pearl Twin, or other models, even with the same frequency. Transmitter mode compatible with 868 MHz Sommer 4020V000 4025V000 4026V000 4031V000 4011V000 4035V002. Technical specifications: Frequency: 868.8 MHz (Rolling Code), Buttons, Controls: 4, Coding: Radio. Programming type: Access to receiver required: Requires a receiver, motor, or opening for programming. The Sommer replacement remote control with the frequency 868 MHz is not an original Sommer remote control. It is manufactured by third parties. The frequency of the garage door remote control is 868 MHz, 4 channels, and can control up to 4 doors. Garage door remote control. Note: Not compatible with 433 MHz. Stable connection: The signal is stable and the range is strong. Whether you're in the garage, leaving it, or even remotely, your garage door responds quickly and opens or closes for you at the touch of a button.