1. Channel positive and negative instructions: the remote control can set the positive and negative directions of channel 1/channel 2/channel 3/channel 4/.
2. Instructions for large and small rudder volume: In order to allow novices to easily control, 1-way/2-way/4-way can switch the stroke amount of the channel,
The default is 100% [1000-2000] for the maximum stroke, and 70% [1150-1850] for the small stroke.