The Hörmann HSM4-40 is a remote control with a dark gray housing, 4 gray buttons and a frequency of 40.685 MHz.
Affordable alternative available: check out the VS-HSM-40 (including key ring).
Attention!
If your remote control has blue buttons, it is 868 MHz and you need a different model.
Gray buttons = 40 MHz, the HSM4-40 is the correct model for you.
Blue buttons = order the HSM4-868 or the VS-027-868-H.