what is the warranty for Apple renewed airpods?

Apple Certified Refurbished Products

Quality products at great prices

Rigorous refurbishment process prior to sale

Covered by Apple’s one-year limited warranty 

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Covered by Apple’s 14-day returns policy 

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AppleCare

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 coverage available for purchase

Engraving and gift wrapping not available for refurbished products

My bad, they do.

Any refurbished devices sold by Apple have the standard 1 year warranty.