Step 1: What is a three channel control and gyro?
There is more than one definition of a gyro. So, what it basically does is it Auto-stabilizes the helicopter. Even though it has a gyro you still will need to use the trim. If you want to see a gyro Google search "toy gyro"; this is the best way to see what a gyro is, because there is websites that will tell you more facts than what I know.