Built with imported N-Channel mosFET's and an ultra fast Atmel MCU & heartbeat make this a high performance ESC with excellent sync capabilities. This ESC has a 3A BEC for solid reliable servo power.Programmable via an R/C controller.It allows you to program all functions to fit your specific needs, which makes it efficient and user friendly. Features:Extremely low internal resistanceSuper smooth and accurate throttle linearityOver heat and over-load protectionAuto shut down when signal is lost or radio interference becomes severe for more than 2 secondsSupports high RPM motorsPower arming protection (prevents the motor from accidentally running when switched ON)New Advanced programming software Programming features:Brake setting (we recommend using brake for only folding props applications)Battery type(LiPo or NiCd/NiMh)Low voltage cutoff settingFactory default setup restoreTiming settings (to enhance ESC efficiency and smoothness)Soft acceleration start ups (for delicate gearbox and helicopter applications)Governor mode(for helicopter applications)Motor rotation( clockwisecounterclockwise)Switching frequencyLow voltage cutoff type (power reduction orirnmediate shutdown) Factory default settings:Brake: offBattery type Detect: LiPo with Automatic CellLow voltage cutoff threshold: Medium (3.0V/65%)Timing setup: AutomaticSoft Acceleration Start Up: MediumGovernor mode : OFFFrequency : 8kHzLow voltage cutoff type: Reduce power Spec.Cont. Current: 30ABurst Current: 40ABattery: 2-4 Cell Lipo / 5-12 Cell Ni-XXSBEC: 5V/ 3A OutputSize: 25*43*9mmWeight: 28g