Lehrer-Modul für mc-10/mc-12 Graupner 3290.12 Required if an mc-10 transmitter is to be used as teacher transmitter in conjunction with a pupil transmitter of the following type: D 14, FM 414, FM 4014, FM 6014, mc-10, mc-12, mc-15, mc-16, mc-16/20, mc-17, mc-18, mc-20 or mc -24. When the teacher operates the integral momentary switch, all the teacher transmitter´s functions are transferred to the pupil transmitter, whose travels and directionsof servo rotation were previously set up carefully to match. The unit is connected to the transmitter circuit board as shown in the sketch in the transmitter instructions. The opto-electronic light-pipe cable, Order No. 3290.4, is also required to complete the connection. The pupil transmitter must be equipped with a corresponding pupil socket.