YKS Upgraded 320A 7.4-11.1V Brushed ESC Speed Controller with Brake for RC Car Truck Water-proof and dust-proof, suitable for all-weather condition races. Two Function Type: Forward + Brake, Forward + Brake + Retreat. Low Voltage Cut-off: When Voltage drop to the over protection, the indicator light will be flashing. Over-Heat Protection and Automatically find the center position. Battery Support: 2S&3S Li-po, 4-12Cells Ni-MH&Ni-Cd. When the temperature reached 100,output power will be cut down automatically. Speed will be slowly, when temperature drops back,the speed will return to normal. Note: If you want to take lipo batteries, please carefully read the product manual. The Jumper connect should be right, avoid burn the ESC.