Up to now, in remote operation robots and remote rehabilitation robots of fields, master-slave control has been adopted. In this study, we proposed applying hobby robots for life whose people need slight assistance. In way to operation of view point, we adopted master-slave control because it is easy to control robots for them. A summary of this life assistance is that people control hobby robot and make the robot assist them life. As a result, people assist their own life by themselves. And the object of this assistance is only people who need slight life assistance. But people are requested to control robots by themselves. In addition, we anticipated that almost people are persons of advanced age. Therefore it is difficult to control robots by controller which is way of pushing buttons for people. So we adopted master-slave control as way of controlling robots because people make robots motion as their motion. So people can control robots sensuously by using master-slave control. In this time, we developed fundamental radio transmitter and receiver circuits and master-slave controller. And we confirmed working those circuits correctly. We will report about that.