... battery gauge, choose throttle-only or pedal assist modes of electric powerDerailleur: SHIMANO 3*7 speed freewheel derailleur, SHIMANO shifterBrakes: ... , foldable design, no-slip pedalsLighting: cold light illuminator systemFunctions: alarm system, rate-limiting, overrun monitor, Low-voltage protection, Over- ... White and Blackcertification: CE EN15194EN14764 20" li-ion battery foldable electric bike