Is it really waterproof?

The listing describes it as waterproof, so it is meant for swimming, showering and hand washing. Ceramic and stainless steel resist water well, but avoid hot tubs and salt water over long periods.

How does it compare with the Oura Ring?

Oura has a much longer track record, published sleep and readiness scores, and a subscription app. This ring is simpler and cheaper in features, so pick it if you want basic tracking without a subscription-style ecosystem.

What sizes are there?

The ring comes in US sizes 6 through 12. Fit matters more than with a watch because fingers swell through the day, so measure at the end of the day.

Which finger should I wear it on?

Most people wear a smart ring on the index or middle finger of the non-dominant hand, where the fit is snug and sensors sit flat. It also works on the ring finger if the fit is right.

The pack contains one ring. A charging cable or dock is not listed, so check with the seller before buying if you need one.

Does it work with iPhone and Android?

The listing does not name supported phones or an app. Ask the seller which app it pairs with before you buy.

Where is the Waterproof Ceramic Smart Ring cheapest?

At Deal.ai, for $21.99, as of our latest check.

Free shipping on everything10% off your first orderNo account needed · Buy 2, save 10% · 3+, save 15%

Waterproof Ceramic Smart Ring

Sold and shipped by Deal.ai

$21.99Free shipping

Buy 2, save 10% · 3+, save 15%

Extra 10% off your first order

Color: Black IC

Size: No.6

Arrives about Nov 21 – Dec 1, from a warehouse in China

30-day full refund: if you're not happy with it for any reason, or it never arrives, tell us within 30 days and we refund you in full. Shipping and refunds