This device automatically starts the timer on the Dx7 when you move out of your fail safe area (usually at low stick)
The device has a little PIC processor and a very few components, it is simply connected to your Dx7
The Device
http://www.drapko.sk/msystem/main.htm
The Manual
http://www.drapko.sk/msystem/dokumenty/Manual_timer_dx7_eng.pdf
Regards
Elias (EatAtJoes)