Wrap
Wrap a non-elastic string or a thin strip of paper around the base of the finger where you plan to wear the ring.
Carbon Fiber Smart Ring
Carbon Fiber Smart Ring
Regular price
$79.99
Regular price
$79.99
Sale price
$149.99
Unit price
per
Free App
No subscription required
Easy Returns
Not satisfied? Return it hassle-free
Free Shipping
Tracked delivery included with every order
Father & Daughter
Find Your Perfect Ring Size
Choosing the correct ring size is quick and easy. Follow the simple steps below to measure your finger accurately from home and find the best fit before placing your order.
How to Measure Your Ring Size
Fit
Make sure it fits comfortably. It should be snug, but not too tight, and should slide over your knuckle.
Mark
Mark the point where the two ends meet or overlap using a pen or pencil.
Measure
Lay it flat and measure the distance from the starting point to the mark in millimeters. Repeat 2–3 times.
Tips for Best Accuracy
Timing Matters
Measure your finger at the end of the day, when it is naturally slightly larger.
Avoid Cold Hands
Do not measure when your hands are cold, as fingers may temporarily become smaller.
Between Sizes?
If your measurement falls between two sizes, choose the larger size for a more comfortable fit.
Ring Size Chart
| US Size | Inner Diameter | Finger Circumference |
|---|---|---|
| US Size 6 | Inner Diameter 16.5 mm (0.65 in) | Circumference 51.8 mm (2.04 in) |
| US Size 7 | Inner Diameter 17.3 mm (0.68 in) | Circumference 54.3 mm (2.14 in) |
| US Size 8 | Inner Diameter 18.1 mm (0.71 in) | Circumference 56.9 mm (2.24 in) |
| US Size 9 | Inner Diameter 18.9 mm (0.74 in) | Circumference 59.4 mm (2.34 in) |
| US Size 10 | Inner Diameter 19.8 mm (0.78 in) | Circumference 62.2 mm (2.45 in) |
| US Size 11 | Inner Diameter 20.6 mm (0.81 in) | Circumference 64.6 mm (2.54 in) |
| US Size 12 | Inner Diameter 21.4 mm (0.84 in) | Circumference 67.2 mm (2.65 in) |
| US Size 13 | Inner Diameter 22.2 mm (0.87 in) | Circumference 69.7 mm (2.74 in) |
If you are unsure which size to choose, contact us before placing your order. We will help you find the best fit at support@father-and-daughter.com .
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Description
Description
Features
- Smart ring with carbon fiber texture finish in black, silver, and rose gold
- Tracks heart rate, blood oxygen (SpO2), and sleep patterns
- Monitors steps, distance, calories, and daily activity
- Supports basic fitness tracking and movement analysis
- Lightweight design (~4.7g) for comfortable all-day wear
- IP68 water and dust resistance for everyday use
- Seamless synchronization with mobile devices
- Compatible with Android and iOS systems
Specifications
- Battery Capacity: 16mAh
- Weight: 4.7g
- Sizes: #7–#13 (17.8mm / 19.8mm / 21.5mm)
- Material: Stainless steel with carbon fiber pattern coating
- Compatibility: Android 5.1+, iOS 8.0+
- Functions: Heart rate monitoring, blood oxygen, sleep tracking, step count, distance, calorie calculation
- Waterproof: IP68 (suitable for daily water exposure)
- Charging Method: Magnetic charging
- Package Includes: Smart ring, charging cable, manual, packaging
- Colors: Black carbon fiber, Silver carbon fiber, Rose gold carbon fiber
Shipping & Returns
Shipping & Returns
Shipping is 100% FREE with traking — no minimum purchase required
Processing time: 1–3 business days
Estimated delivery:
- USA – 5–9 business days (USPS)
- UK – 4–8 business days (Royal Mail & Hermes)
- Other – 7–12 business days
Delivery estimates may vary. All orders are dispatched within reasonable timeframes under consumer law.
Returns & Exchanges: 14-day return or exchange policy. Just contact us — it’s easy.
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
SLEEP TRACKING
WATERPROOF
MULTI-SPORT MODES
LONG BATTERY
FREE APP
Track Your Health
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Need Help?
Which finger should I wear my smart ring on?
The best spot is the index finger of your non-dominant hand. It gives the most accurate readings and comfort. The middle or ring finger also works well — just avoid the thumb or pinky for less reliable tracking.
What phones are compatible?
Our smart jewelry works with most modern smartphones — any Android device running version 5.1 or higher and iPhones with iOS 10.0 or later.
Just connect through the companion app via Bluetooth 5.0 or newer, and you’re ready to go.
What can the ring track?
The smart ring monitors your heart rate, blood oxygen (SpO₂), sleep quality, steps, calories, distance, and stress levels (HRV) .
It also supports multiple sport and workout modes, helping you track your activity and recovery throughout the day.
Some features may vary slightly depending on the model.
What materials are used?
Most of our smart rings are made with a stainless-steel shell and a hypoallergenic finish, with internal electronics fully sealed and sweatproof.
You can find detailed material information in the product description on each item’s page.
When Will I Get My Order?
All orders are usually shipped within 1–3 business days, and you’ll receive a confirmation email with tracking details once your package is on its way.
On average, it takes 5–8 business days for your jewelry to arrive from the time you place your order.
What if I don’t like it? Can I return it?
No worries — we offer a 14-day return policy. Just contact us, and we’ll make the process quick and easy.
