The vehicle is a real fun for children and parents. Since the previous product reviews already criticized the performance of the supplied rechargeable batteries, "Wentronic cable with Tamiya plug 14 cm" were directly two additional batteries "Tecxus NiMh battery AA mignon (6.0V, 2100mAh)" and the necessary Tamya plug with ordered that each have three times the power of the supplied rechargeable batteries. Thus, the vehicle can be used without loss of power for several hours. However, a small disadvantage has the speed. Not that this is too slow, because a rock crawler happens to be not a race car, but an infinitely variable speed control would be difficult on some routes really advantageous and Another fun factor. So can be "just" climbed at a rate, but for this price range that is probably OK. One point deduction for not adjustable speed, otherwise a strong buy recommendation. Amazon as always TOP.