WearableTier

Reader Supported: When you buy through links on our site, we may earn an affiliate commission at no extra cost to you.

CNBRO Smart Ring
Device Profile Specs

CNBRO Smart Ring

Compiled by Gil Sapir, Editor•Manufacturer Specifications

Comprehensive health monitoring in a smart ring design.

MSRP: $129

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.

✓ 100% Subscription-Free ($0/mo)$$ Moderate Tier
Available Finishes:Champagne Gold
📏 Sizes Size #8 to #12 Available
AmazonCheck Price on Amazon

⚡ No monthly subscription fee listed

⚡

⚡ Specification Summary: CNBRO Smart Ring

Top RecommendationCNBRO Smart Ring

CNBRO Smart Ring offers a subscription-free hardware setup with $0 ongoing monthly software fees. Published specifications list up to 7-day battery life, Stainless Steel, and 3g weight.

📋 Key Takeaways:

  • ✓Rated Battery Life: Up to 7 days per charge cycle (30-minute full recharge).
  • ✓Monthly Subscription: $0/month ($129.00 3-year total).
  • ✓Durability & Sizing: Water Resistant water resistance with Size #8 to #12 sizing options.
🎯 Key Highlight

Comprehensive health monitoring in a smart ring design.

🎯 Sizing Guidance

Check manufacturer sizing guidelines prior to ordering.

Advantages & Pros

  • ✓Affordable price at $19.99
  • ✓Durable with water and dust resistance
  • ✓Advanced health tracking features

Limitations & Cons

  • ✕Size options limited to specific ranges
  • ✕Compatibility issues with some devices
  • ✕Battery life could be better

Form Factor & Resilience

MaterialsStainless Steel
Width / Thickness8mm wide / 2.8mm thick
Weight3g
Water ResistanceWater Resistant
Size RangeSize #8 to #12
Sizing Kit Offered✕ No

Power Architecture

Battery LifeUp to 7 days
Charging Time30 minutes
Charger TypeMagnetic charger
Charging Case Included✕ No

Sensor Array & Biometrics

Built-in SensorsHeart Rate Monitor, B-Oxy Saturation Sensor, Mental Stress Monitor, Sleep Tracker
LED Optical ColorsGreen LED, Red LED, Infrared Sensor
Stress Tracking✓ Yes
Cycle Prediction✕ No
Sleep MetricsDeep Sleep, Light Sleep, Wake Time

Software & Ecosystem

Companion AppCNBRO
Supported OSAndroid 6.0 and above, iOS 12.0 and above
Apple Health Link✕ No
Google Connect Link✕ No
Offline StorageUp to days
Bluetooth versionBluetooth 5.2
📏 Sizing Friction Eliminator

Virtual Sizing Assistant

Convert your finger circumference to a standard US ring size. Smart ring brands may size differently from jewelers, so confirm with the manufacturer's sizing guide or sizing kit before buying.

⚠️
Swelling FactorWe recommend sizing up if your knuckles are wider than your finger base, or if you plan to wear the ring overnight (when fingers naturally swell).

Your Standard US Ring Size

US
Nearest Standard US SizeJeweler sizing, not brand-specific
8

Smart ring sizes vary by brand and model. Use this as a starting point and confirm your size with the manufacturer's sizing guide or sizing kit before ordering.

Interactive Sizing Tool

Sizing Decision Matrix (24-Hour Sizing Kit Rule)

Learn how to bypass sizing mismatches. Under the 24-Hour Sizing Kit Rule, users must wear a plastic sizing ring for a full day to capture natural biometric swelling cycles.

Video thumbnail: Official Smart Ring Sizing & Measurement Guide
Step 1 of 3

Do you own or have access to an official vendor sizing kit?

Interactive Calculator

True Cost of Ownership (TCO) Calculator

See how ongoing monthly subscription fees add up over time compared to zero-fee smart rings.

3 Years
1 Year (12 Mo)2 Years (24 Mo)3 Years (36 Mo)
Oura Ring Gen 3$514.64
$299 MSRP + $215.64 sub
Ultrahuman Ring AIR$349.00
$349 MSRP + $0 sub
Shop Oura Ring Gen 3Check Price on Amazon
Shop Ultrahuman Ring AIRCheck Price on Amazon

Cumulative Cost Projection Graph

⚠️ Critical Buyer Warning

The 2026 Smart Ring Blacklist

Common pitfalls in generic budget smart ring listings based on published specifications and public buyer reports.

01

Ring #1 to Avoid: Kuxlagz Smart Ring 2

Reason: Tiny Battery Capacity

Listed with a tiny ~20mAh battery cell, buyers frequently report short runtime between charges that makes multi-day overnight sleep tracking impractical.

02

Ring #2 to Avoid: Ti-Vision Smart Fitness Ring

Reason: Basic Sensor Hardware

Generic optical sensor module without published multi-wavelength motion compensation specs or major health-platform integrations.

03

Ring #3 to Avoid: Weyrinice Smart Ring Health Tracker

Reason: App Subscription Paywall

Places historical biometric dashboards behind a recurring companion app fee that is easy to miss on retail listings.

See the remaining 2 budget ring warnings before you buy.

Enter your email to instantly reveal the final 2 blacklisted rings.

Frequently Asked Questions: CNBRO Smart Ring

Does the CNBRO Smart Ring require a monthly subscription?

No. The CNBRO Smart Ring is subscription-free ($0/month), so its 3-year total cost remains equal to its $129 hardware MSRP.

How long does the CNBRO Smart Ring battery last?

Manufacturer specifications rate the CNBRO Smart Ring for up to 7 days per charge, with a full recharge time of approximately 30 minutes.

What are the CNBRO Smart Ring dimensions and water resistance?

The CNBRO Smart Ring weighs 3g, measures 8mm wide by 2.8mm thick, is constructed from Stainless Steel, and is rated for Water Resistant.

Head-to-Head Comparisons

View All Comparisons →
🔔 Price Drop Radar

Track Price Drops

We monitor Amazon and other major retailers 24/7. Enter your email to get alerted the instant the CNBRO Smart Ring drops in price.