Dyol brings in a new era for mobility control, comfort, quality, and safety. With a slick black ergonomic bi-directional design, Dyol controls acceleration and deceleration in one device. This patented design allows the rider to smoothly control the speed of an electric bike, e-scooter, and more, simply by rolling the wheel inward to accelerate, and rolling it outward to slow down or stop. Dyol can be setup to control both acceleration and regenerative braking on devices that have a controller and a motor that allow for regenerative braking. If regenerative braking is not an option, Dyol can be used to control acceleration only. Rotate Left to Control Throttle | Rotate Right to Control Regenerative Braking. Designed with both Right and Left Handed Versions and an IP-65 rating, Dyol can to be used on any electric mobility device with a handlebar.