New includes brand new, and items that have not been deployed but which may be open-box, plain packaging, worn packaging etc.  Very few of my items are brand new.  Most will have some packaging blemishes.Refurbished comprises two types of offer.  Manufacturer Refurbished is where the factory has tested the unit and confirmed that it meets their specifications.  I don't usually apply more labor to these items so the firmware installed by the factory may not now be the most recent revision.Seller refurbished is where I have invested time in cleaning, testing and repairing an item.  For consistency across different selling channels, I operate to the eBay definition which is "An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller's listing for full details."So the item will be cleaned, tested and fully working but I do not usually replace components speculatively apart from small batteries etc.Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended (unless very clearly stated otherwise).  See the seller's listing for photos, full details and description of any imperfections.