The Official S·3 Magnetic Lanyard is a specially designed safety kill switch that attaches to the handle bars of the bike & around the wrist of the rider. If the two become parted, due to falling off, the lanyard will become detached & the bike will become immobile cutting all power. This unit is specially designed by S3 to easily fit replacing the standard On/ Off handle bar Switch. Fitted in seconds by simply detaching the On/ Off switch connector & then plug in the Lanyard, no rewiring involved. Fits directly onto all bikes already fitted with a handlebar on/off switch. It is now a enforced rule by the ACU that all bikes must have a safety power cut out device fitted & entry to events will not be allowed without one. Article: S3 Lanyard Killswitch Red, Size 10 mm Article: S3 Lanyard Killswitch Red, Size 10 mm, red, Size 10 mm