The JOYSWAY Superior 552 USB Power Slot Car Racing set comes with a USB power system. It is the first and most innovative application in the slot car toys industry. Traditional slot racing set is powered by batteries or transformers. With the JOYSWAY slot racing set, you can use the supplied USB power cable to connect your own power bank (output: 5V 2A) or smart-phone USB power adapter (output: 5V 2A). JOYSWAY USB power slot racing set is user-friendly. Over 25' of the track. Digital proportional speed controller, high-resolution speed control from slow to fast. More advance than traditional slot cars which change speed by resistor. USB power system: the first and innovative application in the slot car toys industry. Convenient, safe, and cost-effective. End-users only need to plug in their own power bank or smart-phone USB power adapter to play. Highly scaled cars with bright LED headlights and a strong magnetic base. Cars run smoothly and quietly because of high precision gear design and installation. Contents: one king orange sports car, one ACE purple sports car, two digital proportional speed controllers, digital display lap counter and one powerbase combo track, one USB power cable, two single-lane s’ shape track, 12 curve track, 13 straight tracks, two banked track, two crossover track, 16 single lanes looping track, eight single lane straight track, four bases of single-lane looping track, one holding post for banked tracks, three bridge stand, one holding post connector, four bridge pillar, four bridge barrier, three bridge track support, 12 guardrails, one manual, label sticker for lap counter and bridge barrier.

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