Includes Losi Radio System with Spektrum 2.4GHz DSM technology - you?ll never have to worry about radio interference Ready-To-Run - only requires a 7.2V Battery Pack and Charger! The front and rear solid axle features a worm gear drive that acts as a brake when no power is supplied The included ESC, with crawler-specific programming, accepts NiMH and LiPo batteries All-metal CV front axle and center driveshafts provide superior durability to the driveline to handle the stresses of rock crawling