Speed Controller X-70 OPTO-Proll new Hacker X Pro Series controllers. Specially developed for high pole outrunner and 2 pole inside runner brushless motors. NEW USB interface allows precise adjustment. Features include automatic timing, auto LiPo detection, selectable acceleration, motor direction adjustment, low voltage cut off, brake on or off, soft start, adjustable timing, and adjustable frequency. Current 40 amps Cells 2 6 LiPo Weight 39g