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Scorpius Wireless
http://www.scorpiuswireless.com/
Australia-based Scorpius Wireless produces four different electronic components designed specically to fit to wooden routed digital slot car tracks or retrofitted to existing Ninco, SSD (Hornby), and Carrera digital plastic track systems. The Scorpius system uses wireless controllers to run up to 24 cars simultaneously without traditional power sharing issues and is designed to run with or without a PC.