The Monster X ESC takes Castle's legendary “monster” performance to a whole new level. The waterproof Monster X handles 2-6S LiPo power for 1/8 buggies, truggies and on-road vehicles as well as 1/10 monster trucks and R/C monsters weighing up to 15 lbs. The addition of a programmable Auxiliary Wire allows users to make “on-the-go” adjustments to several settings, such as torque control and max throttle.