The portal bridge suspension system adopts a tapered tooth internal differential speed reduction transmission structure.The container is loaded with various decoration boxes, fuel tanks, medical boxes, simulation machines.You can upgraded this rc car with light and sound system.Central transmission 3-speed gear ratio can be switched(LOW GEAR 1:64.39 2ND GEAR 1:35.20 TOP GEAR 1:21.14).Adjustable steering angle percentage and gear percentage.The positive and negative switching of the throttle has been turned.This rc car is with closed plastic gear dustproof transmission medium case box.Variable stroke metal shaft transmission system.Front and rear axle differentials can be equipped with manual differential locking.Suspension of large load damping sheet (spring sheet can be added and subtracted).With charge protection,low voltage protection and high temperature protection.