KK Multicopter Controller Board V5.5 for Y3 3-axis 4-axis Y6 6-axis single-axis KK ... Multicopter Controller Board V5.5 for Y3 3-axis 4-axis Y6 6-axis single-axis 100 ... , support normal ESC / analog servo4. Support for single-axis / UFO, Y3 3-axis, Y4-type 3-axis, 4 axis, 6 axis ...