These items are fully functional B-stock we have had lying around the lab and need to liquidate. Some items may have cosmetic defects, rack rash, or be special items like prototypes. Most are in excellent or like new condition and simply open box items. Everything assembled has been tested and is guaranteed to be working, but is otherwise sold as is. DIY kits should be complete, including all critical ICs, but if a small part or two (capacitor or resistor) is missing it will be up to you to source it. We will not be able to answer specific questions or provide photos of specific blemishes on these items. If you are concerned about cosmetic defects, please do not purchase these B-stock items.