Grab the throttle and the On-Board Audio System roars to life, projecting the actual engine sounds from a 900+ horsepower Pro 4X4 short course truck. Prepare to experience the beat of every piston stroke, feel the gear shifts under acceleration, and hear the horsepower as the RPM's scream through the power band. Bash it, crash it, and get it wet. No need to hold back...the sound system is just as rugged as the Slash itself. Flip the rocker switch on the supplied 3-channel TQ 2.4 GHz transmitter to put the truck in neutral to rev up the engine. The precision audio and throttle response connects you to the truck for a whole new driving experience. Traxxas On-Board Audio is the exciting new dimension in Radio Controlled fun!