Unless you are riding a specialised E-Scooter which is meant for offroad, which NIU sells no models of, then it is highly recommended that you do not use your E-Scooter to go off terrain. NIU E-Scooters are meant for only flat firm terrain such as roads and paths.

Going offroad, where the terrain is less constant and unstable could lead to harm for you and possibly anyone else around you. 

Please ensure no matter what that you read the user manual and wear the appropriate safety gear when operating an E-Scooter.