The Traxxas Slash is now available with our exclusive On-Board Audio system. Unlike anything seen before in an electric RC vehicle, Traxxas On-Board Audio (OBA) produces incredibly realistic engine sounds. With included 3-channel transmitter, rev up your Slash in neutral, then flip the switch to drop it into gear and take off! The audio system responds to your throttle input, making every pass, jump, and crash more exciting than ever before. The system is fully waterproof with adjustable volume.