This Hormann HSM2 HSM4 868MHZ remote control (not original Hormann HSM4 868) is the ideal replacement remote. It has 4 blue buttons and operates on a radio frequency of 868 MHz. The Sdre remote control -HSM4 HSM4 868 MHZ can replace the following transmitters: HORMANN HSM2 868, HSM4 868, HS1 868, HS2 868, HS4 868, HSE2 868, HSE4 868, HSZ1 868, HSZ2 868, HSP4 868, HSP4-C 868, HSD2-A 868, HSD2-C 868. This remote control is programmed by self-learning directly in the receiver located near the motor or motorization of your garage door or gate. To program this remote control, you must access the receiver, you can also do it from an already programmed remote control. This remote control uses the radio frequency 868 MHz and has blue buttons. Therefore, do not confuse this remote control with the one with gray buttons.