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But it does WL v686 has a 4ch transmitter and all this functions???

I have a WL v686 and I am building on a Tricopter, and I wonder, how can a 4 channel radio have a lot more functions, like camera filming, camera still shot, led on off, 4 speed rates, and more with only 4 channels?

Hi I am a new member, I am pretty new to multirotors. I have an wltoys 686 but building on a tricopter