Speed controller for 60A waterproof sensorless brushless motor. Cooling fan helps to protect the ESC from overheat and supply stable power. Input voltage : 2-3S LiPo (7.4-11.1V) or 6-9S NiMH battery (7.2-10.8V). Size : 48.5x38x32mm (including cooling fan) / Continuous maximum current : 60A / Peak current : 390A / Weight : 90g / Bec output : 6V/3A