3. Advance angle: divided into low, medium and high. In general, the low advance Angle can accommodate more motors. However, as the motor structure is quite different, please try each advance Angle to get a satisfactory driving effect. 2. Battery low voltage protection mode: limit the throttle to only 40% when the voltage reaches low voltage protection. 1. The type of battery: Lithium battery / NI- battery 4.In order to improve the speed, the advance Angle can be set as the high advance Angle. After changing the approach Angle, it is recommended to test on the ground before flying.