YOA63X Balance discharge monitoring and protection design. No need to worry about the over-discharge problem for the weakest cell. Offers low voltage cutoff protection， over-heat protection and throttle signal lost protection for your aircrafts or helicopters. Output: continuous 40A， burst 55A up to 10Secs. Input voltage: 2-6 cells lithium battery or 5-18 cells NiCd / NIMH battery. BEC: 3A/5V (switch mode). Max speed: 210，000rpm for 2 poles brushless motor， 70，000rpm for 6 poles brushless motor， 35，000rpm for 12 poles brushless motor. Extreme low resistance PCB is used at the power output section to get the best current endurance capability. Safe and high quality brushless ESC for your aircrafts or helicopters. Package Details Weight: 42.80 g Size: 55*28*15 cm Package Includes 1 × Brushless ESC