Wireless technology from Carrera provides even more fun and freedom at the race track. Up to four cars can be controlled simultaneously at a range of almost 10 feet. And because of the unique hand controller design, a racer can be positioned almost anywhere in the room. Must be used with the "Oilcan" Digital receiver tower (Carrera #10101). Up to four controllers may be wireless, but if using six controllers, two must be corded. It is compatible with Carrera"s Digital 124 and Digital 132 sets.