We cannot duplicate of the remote controls or key fobs if they get lost.
If you want to get an extra key, please visit your local NIU dealer to get a blank key. With the blank key, you can have a locksmith copy the original key.
In case all the keys are lost, please visit your local NIU dealer for assistance. You may use the store mapper link to find NIU dealers in your area:
https://www.niu.com/en/find-store