Remote control Dickert MAHS27-04 with 4 channels.
NOTE: The MAHS27-04 transmitter with orange push buttons and red LED light operates at 27.015 MHz. If you have a version on 27.045MHz, then there is no Dickert replacement and your receiver must be exchanged or use a duplicate transmitter. However, it works at 40.685MHz and is not compatible. There are also hand transmitters with a different color push button (red / blue / purple) and different color LED lights, but they are all NOT interchangeable.
Do you have a variant with a green LED light and if there is a micro switch (DIP-10) in it, you must have the FHS10-02.
Set the microswitches on the inside (DIP-10) to match an already functioning handheld transmitter . No working handheld transmitter? Then align them with the microswitches on the receiver / drive.