Features: -with Blheli_S firmware -4 in 1 ESC, more easier to install -with 24MHz BB1 Clip -Support oneshot42 multishot, Dshot150 and Dshot300 -Small size and light weight -Improved robustness to very high input signal rates -Beeps can be turned off by programming beep strength to 1 -Throttle cal diffirence is checked to be above required minimum before storing -Throttle cal max is not stored untill successful min throttle cal.