There have been several changes to radio frequencies that are used for the remote controls on Supramatic, Promatic and earlier Ecomatic garage door openers which are summarised here.
Unlike some manufacturers,
Hormann have been very efficient in making the different frequencies of their handsets easily identifiable.
Supramatic Promatic/Ecomatic remote controls can be identified as follows,
26.995MHz have a grey case with vivid green buttons
40.685MHz have a grey case with light grey buttons
868.3MHz have a grey case with light blue buttons
868.3MHz BiSecur have a black case with black buttons
GARADOR Hormann Garage Door Remote Control Key Fobs Hand sets, Transmitters, Zappers, HSE 868, HSE BISECUR, PROMATIC, SUPRAMATIC Operator