HERE IS A BRAND NEW WITHOUT ORIGINAL BOX LATHEM CONVERTER WITH POWER SUPPLY. THIS DEVICE WAS NORMALLY USED WITH PC TIME CLOCKS TO VONVERT FROM RS-232 TO RS-485 WHICH WOULD TRAVEL LONGER DISTANCES WITHOUT LOSS OF SIGNAL. YOU CAN PROBABLY GO TO THE LATHEM WEBSITE FOR INSTRUCTIONS. IT IS NEW WITHOUT ORIGINAL BOX. BUYER PAYS SHIPPING I WILL THROW IN A SERIAL CABLE WITH PLUGS TOO.