The standards our curators use to grade items, and what sellers must follow when writing item descriptions. If you're a buyer, this also helps you understand the condition terms used in each listing.
Electronics are judged on seal and warranty status and on whether everything works — not just on how they look.
Never opened, factory plastic or sticker seal still intact.
The seal has been broken (to check the contents, for instance) but the unit has never been used or switched on. All original accessories present.
Used, with light cosmetic wear (fine scratches), but every function works without fault.
Works, but with issues that must be declared honestly: poor battery life, a loose port, and so on. These MUST be spelled out in the description.