THIS UNIT IS FOR ProX SETS. The brand new Carrera wireless infrared technology is the latest in a series of product enhancements to provide more fun and freedom while racing. Carrera wireless is available for all Carrera PRO-X, Evolution and Exclusiv race tracks. The next level in slotcar racing! Carrera wireless features precise and immediate response without any delay from the controller. Carrera Wireless - the advantages: No delay in terms of time and thus optimal response of the speed controllers and the cars 4 different frequencies, to be selected at the speed controller, can be used with up to four cars Decorative and original Mobil-Tower as receiver Additional receiver Minimum range of 3 m / 9.84 ft. 3 transmitters in the speed controller provide for large transmission angle Almost no influencing caused by different lighting conditions Optimum haptics of the wireless speed controller with put-down device and additional neck string Wireless control box offers the possibility to choose between infrared- and standard play mode; standby display Turn off function after approx. 2 minutes Battery operated (3 x AA) - batteries not included Includes: 2 Controllers 1 Receiver/tower 2 neck strings operating instructions