Count useful pieces before comparing kit size
Check pairs, attachments and storage separately.
Make a list from the box
Mark what is included, what is an attachment, and what is sold separately. Four cuffs may mean two pairs, and a charger or connector may be counted among the pieces.
Check dimensions for each item
A one-size claim does not explain wrist and ankle fit. Record the measured range and closure for each cuff. See the cuff fit guide for help reading those ranges.
Decide which pieces you actually need
A smaller set with useful pieces can be a better choice than a larger bundle full of duplicates. Keep the parts list in case you need to identify a replacement.