Whiskey Thumb Throttle Bafang KitThumb Throttle Kit The thumb throttle kit is an add on that allows you to throttle the bike without the need to pedal all the time. It is for private use only and plugs straight into the existing controller on the bike. For private use only* Suitable for all Bafang Mid drive Kits, including the Ultra Suitable for both the left and right side of the handlebar Easy plug and play into your existing controller