Shimano STEPS SW-E8000-L Left Hand Assist Switch The Firebolt Switch Unit control with intuitive operation is ergonomically designed for a MTB. It’s the ultimate in comfort and reliability as you switch between modes while blasting through the trails. – The e-MTB Switch Unit (SW-E8000-L) is ergonomically designed for the specific demands of MTB riding such as riding through tight singletrack and bumpy terrain – Accurate, smooth shifting between power-assist modes regardless of weather or terrain conditions – Switch between Boost, Trail, Eco and Walk settings in a flash during the ride. Shifters incorporate the same design and shifting feel as XT Di2 TECHNICAL SPECIFICATIONS – Four support settings to choose from: Boost, Trail, Eco, Walk – Boost: Complete support for a max boost and expert