SUPERFUN 302 - The updated Joysway USB electric power system is an innovative slot car track set containing everything you need to get started. Traditional slot racing sets are powered by batteries with limited life or a transformer, but with Joysway slot car racing sets, you can use the supplied USB power cable to connect to your choice of power: Portable battery (Output:5V2A), smart-phone USB power adapter, or USB outlet plug adapter. Each 3-inch slot car has its own controller and features a comfortable ergonomically designed pistol grip speed controller with improved speed control so you can determine the exact speed for your slot car. Most slot cars only have 2 or 4 fixed speeds. These 1:43 scale slot cars are highly detailed with bright & stable LED headlights and a strong magnetic base. Cars run smoothly and quietly because of the high precision gear design and installation. The improved mechanical lap counter and counts from 1 to 10 laps. The powerbase integrated as combo track provides short circuit protection ensuring ultimate safety. The mega tracks are wider and longer compared to traditional 1/43 scale slot racing tracks making the distance between the cars wider. The polyfoam tray and colorful gift box packaging are made to hold all the components parts for easy storage. Track Length 668cm (21’9’’) and layout size 230 x 85cm (7’6’’ x 2’8’’).