Radio transmitters and component parts therefor, for use with radio controlled model aircrafts, model helicopters, model cars, model boats and toy robots; radio transmitter accessories, namely, wireless radio transmitter trainer systems consisting of a radio transmitter and receiver and a cable for electrical signal transmission, for use with radio controlled model aircrafts, model helicopters, model cars, model boats and toy robots; radio receivers, and component parts therefor, for use with radio controlled model aircrafts, model helicopters, model cars, model boats and toy robots; hobby grade servo motors, motor controllers, gyros, flight stabilizers, batteries, and engines for model aircrafts, model helicopters, model cars, model boats and toy robots; cases especially made for transmitters for radio communication, such transmitters used with radio controlled model aircrafts, model helicopters, model cars, model boats and toy robots