4 month old black E-bike can go about 40km on a single charge. The charger is also really small and light if you are going further you can charge the battery in between. ¥2400 new four months ago. All the lights and sounds work and has a lock installed on the rear wheel and comes with an additional chain lock. Brakes will need done in the next couple months but they are working fine now. Leaving Beijing soon so would like to sell ASAP.