1. Mixing mode (default) (throttle/steering mode): 2 or 3 channels (2 channels are recommended, because 2 channels automatically return to the center) to control the throttle, 1 channel (or 4 channels) to control the speed difference steering, the throttle ratio is 100% , the steering ratio is 100%, and the steering priority is given. Suitable for: Tanks (in this mode, gun control can play tanks), 4-wheel drive cars 2. Dual independent: it is equivalent to two independent ESCs 3. Two-way synchronization: In the mixed control mode, if the single yellow wire is not connected, or the single yellow wire is connected to the receiver "-", the two motors will be controlled by the accelerator synchronously. Colour:As Shown Material:PC+Plastic Package Contents: 1 x Bidirectional Brushed Speed Controller(Due to different product batches, the appearance may vary, which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.