It depends on age and description. Ostensibly it should be fit for its "stated" (in your description) purpose.

You should consider this when selecting a generic ebay item condition from the drop down list.

That's why you often see items listed as (especially second hand items) "working but sold for spare parts only"

If your items have obvious intermittent faults ie. "sometimes switches off when it gets hot or maybe "second channel not

always working" it's better to state that upfront so that the peruser has a good idea of the working condition of the item.

If you are unsure about an item re working condition then state exactly that fact.