The IEC "Systems Trainer" is a very popular trainer because it involves the students in invention. It is a panel with non-removable components for the teaching of the basics of electronic systems that use INPUTS and OUTPUTS. A set of sensors with sensitivity controls are interconnected to create a logical system as found in washing machines, burglar alarms and so on. An excellent experiment book leads the student down the path of designing and building working systems. The kids love it ! The trainer runs from a 12V.PlugPak or any 12V.AC or DC power supply. A clear cover protects the system during storage and provides a convenient tray for the connection cables provided.