This clever piece of kit transforms your Epson B300/310 so that it will print on both sides of the paper without you having to print one side, take the paper out, turn it over and put it back in again, then print the other side. It is very simple to install and you only have to change one setting in the printer set-up to get it working. It does add a few centimeters to the desk footprint (at the rear). The 310 is not a budget printer so why they don't include such a low price piece of kit as standard in the box is a complete mystery.
Works as expected. Very easy to install in the back of the printer. I had to look sometime to activate the function in the software: they should provide a guide for configuration. Does not look as solid as the printer but let's see with time.