Vostok - Transponder (Vostok system only) For Frosty Models - Skegness Models & RacewayIdeal for those wanting a budget but great option for the new Frosty's Raceway! Our RC transponders help you to track lap times and give better insights in your performance. You install the transponder in your RC car into the receiver BATT or a Channel port. If you race with multiple RC cars its convenient to install a transponder in every car. A transponder has a seven digit number. Features: All your results in your personal profile. can be used for