Traxxas Revo 3.3: 1/10 Scale 4WD Nitro-Powered Monster Truck with TQi 2.4GHz Radio & TSM, Blue TRX 3.3 racing engine delivers massive power and torque to all 4 wheels to conquer any terrain at speeds up to 45mph TQi 2.4GHz Transmitter with Traxxas Link wireless module, factory installed telemetry sensors, and TSM stability control Heavy-duty reversing transmission with exclusive OptiDrive Electronic Shift Module Rechargeable receiver battery, EZ-StartBattery and 2-amp DC peak detecting charger included Wider, taller stance with new Geode wheels and 6.3" Maxx-sized tires and dual digital waterproof ball-bearing servos