TK Smart Ring
TK Smart Ring
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Premium Quality
Exceptional craftsmanship with durable materials and attention to every detail.
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Excellent Value
Stylish, functional accessories that deliver great value without compromising on quality.
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Highly Recommended
A trusted choice loved by customers who appreciate both style and performance.
Your Health. On Your Finger.
The TK BioSync Performance Ring tracks your health 24/7—without the bulk of a smartwatch or monthly subscriptions.
What It Tracks
❤️Heart Rate & HRV
🩸 Blood Oxygen (SpO₂)
😴 Sleep & Recovery
🏃 Steps, Calories & Activity
🏅 Multiple Sports Modes
👆 Gesture Control
Built for Everyday Life
✔️ 5+ Day Battery Life
✔️ Water Resistant up to 6m
✔️ Lightweight & Comfortable
Smarter Insights. One Simple App.
Monitor your health, workouts, and recovery through the Luck Ring app with clear, actionable insights.
No Subscriptions. Ever.
One purchase. Lifetime access. No monthly fees.
Coming Soon — Join the waitlist and be the first to know when when new launch.

Find My Ring Size
How to Measure Your Finger
- Wrap a strip of paper, string, or measuring tape around the finger where you'll wear your ring.
- Mark where the ends meet.
- Measure the length in millimetres (mm).
- Match your measurement to the size chart below.
| Finger Circumference (mm) | TK Ring Size |
|---|---|
| 54.3 mm | 7 |
| 56.2 mm | 8 |
| 57.8 mm | 9 |
| 62.6 mm | 10 |
| 64.6 mm | 11 |
| 66.4 mm | 12 |
| 69.4 mm | 13 |
For the most accurate fit, measure your finger in the evening when your fingers are at their normal size. If you are between sizes, choose the larger size. To ensure accuracy do measurements more than once.