hello everyone , I'm selling my old xiao-niu n1s , with no signs of rust on the entire vehicle in a nearly new state. Not a single screw has been turned, and it remains in its factory condition (currently only driven for over 1300 kilometers). All functions are normal. The original lithium battery has a range of about 50 kilometers. no app available for this model ,it's an old models bike, and the documents are gone. only in Shanghai and self pick up