Leonelli lanyard type magnetic kill switch.
Now mandatory in all FIM and Australian Trials competitions, this is the type used by all the top teams, including all the Gas Gas Factory riders.
It has a stretchy cord so you can remove your hand from the bars - but part company in an OFF and the engine is cut dead.
Save the bike spinning out of control after an accident
Stop bike getting scratched or damaged
Stop the bike revving it's head off with a jammed throttle, and being up for an engine re-build
Stop the bike from injuring a minder, or spectator.
REPLACEMENT LANYARDS ALSO AVAILABLE AS SEPARATE ITEM