Engineered for 8S LiPo power! The mammoth X-Maxx takes monster bashing to extreme heights – and now it’s compatible with 8S LiPo power for extreme speeds to match! In addition to its 13.8” height, the X-Maxx features Traxxas Stability Management for superior traction on any off-road surface, plus a self-righting feature on the TQi transmitter flips it in the event of a rollover. Upgrades include a Maxx Duty Drivetrain, Torque-Biasing Center Drive and a rear wheelie bar. Specifications: Length: 29.8 in (758 mm) Width: 22.2 in (540 mm) Height: 13.8 in (350 mm) Front Track: 22.2 in (540 mm) Rear Track: 20.6 in (525 mm) Wheelbase: 18.9 in (480 mm) Weight: 19.1 lb (8.66 kg) Requirements: Two 4S 5000mAh (min.) LiPo batteries, LiPo-compatible charger, 4 “AA” batteries, LiPo charge bag Source (Tower Hobbies): http://www.towerhobbies.com/products/traxxas/trad78_e.html