Redcat Vertex-6 Crawler 1/6 RTR 4WD Electric Brushless Rock Crawler (Grey) is a ready-to-run Vertex-6 Brushless built for large rocks, steep grades, and extreme large-scale crawling. It uses high-torque brushless 4WD and includes a large 1/6 chassis, heavy-duty axles, articulated link suspension, and oversized crawler tires. The large footprint and brushless torque are built to maintain traction and control on obstacles that overwhelm smaller crawlers. Recommended power package (sold separately): one 5000–7000mAh 4S hardcase LiPo battery with XT90 connector and LiPo balance charger rated for 4S with an XT90 charge lead.