The Sdre-HSM4 868 MHz remote control (not an original Hörmann HSM4 868) is ideal as a replacement remote control. It has 4 blue buttons and works on the 868 MHz radio frequency. The Sdre-HSM4 HSM4 868 MHz remote control can replace the following transmitters: Hörmann HSM4 868 MHz, Hörmann HS4 868 MHz, Hörmann HSM2, Hörmann HSP4 868, Hörmann HS1 868, Tubauto HSM4 868 MHz, Tubauto HS4 868 MHz. It is NOT compatible with the Hörmann Bisecur HSE1 HSE2 HSE4 868 BS HS1 HS4 HS5 HSS4 HSP4 HSD2 remote control marked "BS". This remote control is programmed directly to the receiver located near the motor or opener of your garage door or gate using the self-learning feature. To program it, you need access to the receiver. However, you can also do it from a previously programmed remote control. This remote control uses the 868 MHz radio frequency and has blue buttons. Therefore, do not confuse it with the remote control with gray buttons.