Description suspension Detailed truck body with clipless body retention system Ready-to-run – just add battery and charger ARRMA BIG ROCK 223S BLX 4X4 Monster Truck RTR Features Ready-to-run – just add battery and charger Install a 2S LiPo battery for 35 mph maximum speed Use a 3S battery for 50 mph top speed Spektrum DSC (Dynamic Stability Control) and throttle limiting keep you in control Stronger, ventilated composite chassis Super-tough 4X4 drivetrain Easy to use center diff module All-metal gear center differential Stealth monochrome electronics Stronger all-terrain suspension Adjustable oil-filled shocks Impact absorbing bumpers Higher side guards for improved dirt management Driveshaft stone guard Spektrum SLT3 2.4GHz 3-channel transmitter Spektrum S662 metal-geared waterproof digital servo Spektrum SLT 80A 2-in-1 waterproof 2S/3S ESC and receiver Spektrum 3100Kv brushless motor and 35mm motor cooling fan Hidden clipless body retention system Truck body with grille, nameplate, and other details Folding wing mirrors dBoots Ragnarok all-terrain tires 4 “AA” transmitter batteries Includes 2.0mm and 2.5mm hex drivers *For details on waterproof standards, please refer to the product instruction manuals