Dave,
I found a specification :
**LINK**
Technical Details:
Operating Voltage Transmitter 4.8 v to 6 v (4 cells)
2.4 Ghz FHSS-System
Two continuously adjustable fully proportional channels
Four on/off buttons
Three Switches On/Off/On
Three Switches On/Off
Servo Reverse for Channels 1 to 4 (reversal of the running direction)
Trimmers for Channels 1 to 4
Receiver power supply 4.8v to 6v (4 cells NiMH)
Graupner-JR plugs (connectors)
Charging socket (inner pole is positive)
Battery status led indicator
…… so I'm slightly confused as this says 10 non-proportional channels (switches/buttons) and 2 proportional channels …. but there are 14 channels (see photo of Rx) and the photo of the Tx seems to show 2 sticks which will normally have 2 axes each and thus a total of 4 proportional channels. Nevertheless, a useful bit of kit.
Ian