When you power a car, it will try to connect to any orphaned controller who also seeks connection at the same time. In practice that means that controllers are interchangeable at the time of handshake with cars, but once connection is established the control is stable.

For most of the cars we sell endurance is about 20 min. Then charge a car for about 30 min.

The cars have no special protection of its electronics against water, so do not drive this car in rain, snow, water. Always park it in a dry place. Do not drive in sands as well.

Most of the cars are safe unless jumping from higher than 5cm. Do not throw the car on the floor, always place it by hand.

There is very little room in there to access and remove whatever wraps around the axles. Before disassembling the car as the last resort, try a needle and small tweezers.