These are 3 pieces of high quality 868.8Mhz rolling code SOMMER compatible remote control replacements, that replaces your Sommer 4026, Sommer 4020, Sommer 4031, Sommer 4025, Sommer 4035, APERTO remote controls. Parameters: 868.8Mhz rolling code frequency•battery and keychain included • High quality SOMMER replacement remote !! HOW TO PROGRAM YOUR REMOTE : Program it like your original SOMMER remote! Typical programming is as follows: 1) Press the LEARNING button on the radio receiver or on the control panel, once for channel one, LED 1 lights up, twice for channel two, LED 2 lights up. 2) Make a transmission by pressing one of the desired CH buttons of the transmitter (within the range of the radio receiver). LED flashes and then extinguishes according to which channel has been selected. 3) Repeat process described under points 1 + 2 to teach further manual remote controls on to given radio receiver. Max. 112 memory slots are available. 4) Press the transmitter button to test operation. Note: To remove a single transmitter's code or all transmitter codes from the receiver memory please refer to your receiver manual. THE PROGRAMMING VIDEO: https://www.youtube.com/watch?v=lHL-zHHzT0Q . If you want to increase the remote control reception range up to 150-200 meters, then you can connect this aerial: https://www.amazon.de/dp/B01MYO7MP6 . IF YOU HAVE ANY QUESTIONS ABOUT YOUR PURCHASE PLEASE CONTACT US!