This is a compact seven segment piston display with a decoder attached. It decodes binary straight to hexadecimal and puts it into the display. Its the same as my other design, but now instead of decimal (0-9) its hexadecimal (0-F)! So if you need a decimal one, check my page for it! :) You can input binary with the levers in the back, read them from left to right! The lever's right state, is zero, its left state, is 1. There will be an example in the screenies. Or you can remove the levers route the inputs to the ground and hook them up to a calculator, alu, counting machine, etc. Hope this helps, and always I'll answer questions and help those who need it! The unit is also perfectly modular btw, so stack as many next to each other as you need, that's what it was designed for after all!