This is the 1/7 scale, brushless electric powered, 2.4GHz TQi radio controlled Traxxas Ready To Run XO-1 On-Road Car with Traxxas Stability Management. For Expert Level RC Car Drivers at Least 16 Years of Age. FEATURES: Traxxas Stability Management (TSM): Superior tuning algorithms run on high-speed electronic components to control wheel spin and steering direction on loose dirt, concrete and even ice and snow. TSM can be fine tuned or turned off by adjusting the multi-function knob on the TQi transmitter or the slider in the Traxxas Link app Chassis: 0.12" (3mm) thick 6061 aluminum, dual plane design, dark titanium in color with channeled extensions, front splitter, smooth undertray and rear diffuser (canard equipped High-Downforce splitter included) must be installed for 100mph operation, see COMMENTS below Drive: All wheel with extruded aluminum main driveshaft with steel spline dual CV driveshafts and Cush Drive system-an elastomer damper between the spur gear and drive hub to absorb drivetrain shocks Brushless Motor: Traxxas/Castle Creations Big Block 1717 brushless motor with ABEC-1 bearings, finned heat dissipating case, sintered Neodymium magnets and superior electromagnetic design for massive acceleration ESC: Castle Creations Mamba Monster Extreme with integrated capacity bank and proprietary software created only for the XO-1, programmable low voltage detection, reverse delay with lockout Radio: Traxxas TQi DSSS 2.4GHz high output with Traxxas Link Wireless Module that allows wireless connection to the Traxxas Link Application with the included Traxxas Link Module for instant Bluetooth connectivity to an intuitive high definition graphical user interface featuring Real-Time Telemetry, Customizable Dashboards, Steering/Throttle Expo, Steering/Braking Dual Rate, Servo Reversing, Endpoint Adjustment, Profile Customization and Sharing 5 channel receiver with 3 telemetry ports, factory installed telemetry sensors, and failsafe is included and enables model to be tuned from an iPhone 4S, 5, 5C 5S or iPod Touch 5th generation or later, iPad 3rd generation or later, or iPad Mini Motor Mount: 8mm thick aluminum Steering Servo: Traxxas 2075 digital high-torque Shocks: Oil-filled hard anodized aluminum GTR shocks with titanium nitride shafts, road-tuned 1.6N/mm (9.1lb) rate springs Shock Towers: Blue-anodized 7075-T6 aluminum Transmission: Single speed Differentials: Revo spec sealed, silicone filled limited slip with hardened steel bevel gears and 5mm output shafts Body: Trimmed and painted 0.04" (1mm) thick polycarbonate with injection molded rear wing Tires: 118+mph speed rated belted slicks with foam inserts, 4.29" (109mm) outer diameter, 1.7" (43mm) wide front, 2" (51mm) wide rear Wheels: Black chrome Split spoke with 17mm hex Battery Compartment: Scalable to fit different size batteries 6.1 x 1.9 x 1.1" (155mm x 50mm x 29mm), optional expansion kit for eight selectable height configurations Steering: Dual bellcrank with integrated servo saver, blue-anodized 6061-T6 aluminum steering blocks with 6x12mm ball bearings Ball Bearings: Full set, rubber sealed Caster: Adjustable, caster/toe-in refers to the angle of the front suspension when viewed from the side of the car in relation to the chassis Camber: Adjustable front and rear, camber refers to the angle of the tops of the tires from vertical when viewed from front or behind vehicle INCLUDES: RTR XO-1 On Road Car with TQi 2.4GHz Radio, Docking Base, Wireless Module, Painted Body, Steering Servo, Brushless Motor & ESC, Traxxas Stability Management, stock 14 tooth Pinion Gear and 46 tooth Spur Gear, 34 tooth Pinion Gear and 46 tooth Spur Gear for 100mph operation (see COMMENTS below) REQUIRES: Battery Charger: LiPo compatible Batteries: Two 3-cell 5000mAh LiPo batteries with Traxxas High-Current connectors LiPo Charging Bag AA Batteries: Four for transmitter Maintenance and track equipment Vehicle- SPECS: Length: 27" (686mm) Overall Height: 5" (127.5mm) Wheelbase: 15.91" (404mm) Track: distance from outer edges of tires, same side Front 11.61" (295mm), Rear 11.81" (300mm) Center Ground Clearance: 0.59" (15mm) Gear Pitch: Module 1.0 Overall Drive Ratio: 9.36 Weight: 8.6 lbs (3.9 kg) (w/o batteries) 10.3 lbs (4.67 kg) (with batteries) Front Shock Length: 3.27" (83mm) Rear Shock Length: 3.39" (86mm) Body- Length: 26.8" (680mm) Width: 11.2" (284mm) Height: 4.5" (114mm) Thickness: 0.04" (1mm) COMMENTS: Unlocking 100+mph speed capability requires the Traxxas Link App (download from the App Store), an iPhone or iPod touch (sold separately). The canard equipped High-Downforce splitter and the 34 tooth Pinion Gear and 46 tooth Spur Gear (all included) must also be installed. The Traxxas XO-1 is available with the following body colors; Blue, TRAD55BB Red, TRAD55RR Black, TRAD55LL White, TRAD55WW The Duratrax DTXC1866, Onyx LiPo 3S 11.1V 5000mAh 25C is an ideal replacement battery. The Traxxas LiPo batteries #2878 (TRAC2878), and #2857 (TRAC2857) require the Battery Tray Expansion Kit #6427X (TRAC6429), and #6426X (TRAC6430).