Yes — our smart ring tracks heart rate, sleep, steps, calories, and SpO₂, plus it’s water-resistant, comfortable, and lasts for days on a single charge.

How to Find Your Perfect Fit

Our rings are true to size with US ring sizes! Getting the right size is quick and easy — no special tools needed!

METHOD 1: Measure Your Finger (Perimeter Method)

STEP ①

Cut a thin strip of paper or tape and wrap it snugly around the base of your finger. Mark the point where it overlaps with a pen or pencil.

 STEP ②

Straighten the strip and measure its length with a ruler. Match your measurement to the sizing below.

Size 5 → 54-56 mm
Size 6 → 57-59 mm
Size 7 → 60-62 mm
Size 8 → 63-64 mm
Size 9 → 65-67 mm
Size 10 → 68-70 mm
Size 11 → 71-73 mm
Size 12 → 74-76 mm:
Size 13 → 76-78 mm:

NOTE: The measurements shown are finger perimeters, taken by wrapping paper or tape around the base of your finger. These numbers may be slightly different from official US ring circumferences because they reflect the practical way your finger is measured, not the exact inner circumference of the metal ring.

Pro Tip: If you're between sizes, choose the size which is closest to your measurement — especially if you plan to wear your smart ring all day.

OR

Step 1:
Find a ring that already fits the finger you’ll wear your smart ring on.

Step 2:
 Use a ruler or measuring tape to measure the inner diameter of that ring in millimeters — straight across the center.

Match it to the sizing below:

Size 5 → 15.7 mm
Size 6 → 16.5 mm
Size 7 → 17.3 mm
Size 8 → 18.2 mm
Size 9 → 18.9 mm
Size 10 → 19.8 mm
Size 11 → 20.6 mm
Size 12 → 21.3 mm
Size 13 → 22.2 mm

Tip:
Measuring a flat ring on a hard surface gives the most accurate results.

1. Secure the smart ring on your finger.

2. Connect via Bluetooth to the Luck Ring app (no subscription required).

3. Wear it daily—everything's automatic: sleep, heart rate, steps, stress & more.

📘 Full user guide + quick‑scan QR code to video tutorials included!

We love our pieces and are confident you will too! That’s why we offer a 30-Day, Risk-Free Try-On. If you're not in love with your new order, we will give you a refund, no questions asked!

Lume offers the same core tracking features—like sleep, heart rate, steps, stress, and cycle insights—without the $400+ price tag or monthly membership fees. You'll get real-time health data through a free companion app. No locked features, no upsells.

Enjoy up to 7 days on a single charge, depending on your usage. And it fully recharges in minutes with the included charging case.

1 × Smart Ring
1 × Charging Cable or Dock
1 × User Guide
1 × Protective Box/Case

Just download the free app (iOS or Android), pair the ring via Bluetooth, and start tracking your health in seconds. 

Nope! Lume comes with a free lifetime app—you’ll get full access to your sleep, wellness, and activity data with no hidden costs or subscriptions. Ever.

You’re covered by our 30-day return policy. If it’s unused and in original condition, we’ll make it right. We also offer free replacements for any defects.