Siemens miniTek Connection Manual page 7

2. Or, plug the cable into the audio out sockets of your device using
cable 3 and either cable 1 or 2. These sockets are typically coloured
red and white and most audio devices have them. Plug one end of
cable 3 into the device and the other into either cable 1 or 2 which
should also be connected into your miniTek/Tek Connect.
Tek Connect
Phono socket
Cable 3
Cable 1 or 2
Cable 1 or 2
miniTek