When constructing an electric, use the smallest practical receiver nicads and servos for your situation. Weight conservation here will make a better flying plane in the end. Flaps and retractable landing gear, if applicable, may be controlled by knobs and switches on the top. This particular transmitter can control 6 functions, or 'channels'. At flying fields it is very important that no two flier be using the same frequency at any one time.
Bad things happen otherwise.
For all but the largest planes, you can control the plane as long as you can see the airplane.