Derailleur is in original box and has never been mounted. We had a local high-end bike shop inspect this derailleur and confirm that it is updated and working correctly.This will ONLY work with Shimano Dura-Ace Di2 shifters and wiring units coded 7970. Please feel free to message us with any questions before ordering. We are available to answer questions Tuesday-Friday 11am-6pm MST. Please be sure that the product you're ordering is compatible with your bicycle. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Front Derailleurs". The seller is "bicyclecollective" and is located in this country: US. This item can be shipped to United States.