ON THIS WIKI
The Automatic Compressor is a machine added by GregTech that is an upgrade to the normal IndustrialCraft2 Compressor. It serves the same function, but has a slightly different method of operation. It has two each of input and output slots and also has two extra buttons in the bottom-left corner of its GUI. Also note that it cannot receive power from its front face, as is the case with all of the other automatic machines. Therefore, cable should be hooked up to any of its other faces.
The left button with a blue lightning-bolt icon is a button that, when activated, allows for the machine to transfer power to other adjacent machines which need it once it has used all the power it needs from the packets it receives. The right button with an orange and black icon is a button that, when activated, makes it so that all products of whatever operation the machine is currently carrying out be deposited into an inventory on the back face of the machine. This button will not make the machine eject items onto the ground or into Pneumatic Tubes or into Pipes of any sort.
As with upgrading other IndustrialCraft2 machines into their automatic variants, all that is necessary is to combine a Conveyor Module with a Compressor in a crafting grid in no particular shape. As with their non-upgraded variants, automatic IC2 machines can handle voltages of up to and including 32 EU/p, and will explode if given anything greater.