How We GradeOur Grading System, Explained
Grade A vs Grade B: what the labels mean, how we test battery health, and why we show you the numbers.
July 8, 2026Read more
Refurb Guides & Grading Tips
Buying guides, grading explainers, and honest advice from the Open Box team.
Buying GuidesHow to Buy Refurbished Earbuds Without Getting Burned
Battery health, grading systems, and what 'Grade A' actually means — what to check before you buy.
July 1, 2026Read more