The choice between single click shift mode or hold-down multiple shift brings versatility into the mix, while short stroke paddles provide a natural fit and feel. A tactile click prevents mis-shifts and a tunable third button allows for additional system tuning and customization on the E-Tube app.Key Features:Ergonomic Evolution: Familiar fit and I-Spec EV adjustability make this Shimanos most natural-feeling shifter yet. Fast Action: Precise, lightning-quick wireless shifting activated by Shimanos customizable, and satisfyingly tactile shifting switch. Finely Tuned: Assign a function to the programmable third button through the E-TUBE PROJECT app, with full switch and e-bike customization. Feature Rich: Short stroke tactile shift paddles, hold down multi-shift, rubber traction pad and I-SPEC EV or clamp band, all in a tidy, ergonomic package.