Four or Eight channel device controller can be remotely controlled by mains 220V phase line. The farm house electric poles or industrial machines or home automation can be controlled by this. This is a complete, assembled working project / model (duly tested) at our work shop. This is a handmade project on a general purpose PCB and uses Electronics / Electrical components as per requirement of a particular model. A rough report & study material related to project will be mailed to student on request.