All three series share the same sensor array and the same app. The difference is shape, finish and fit — so we ask about those instead of printing a spec sheet that tells you the cheap one does the same job.

Answer these and the series picks itself

If your size is US 7 or below , take Slim — the full-width band will feel bulky on a small finger. If you are US 8 or above and want the most surface to read, take Signature . Choose Ceramic only if the look is the priority; it is not on sale yet.

The full table

Signature — Slim — Ceramic

Band width — Full — Narrow — Full

Sensors — 3 optical + 2 temp — 3 optical + 2 temp — 3 optical + 2 temp

Battery — Up to 7 days — Up to 7 days — Up to 7 days

Sizes — US 6–13 — US 6–13 — US 6–13

Finish — Brushed titanium — Polished titanium — Polished ceramic

Price — $49.99 — $49.99 — Not on sale yet