Smart Ring with Sleep Monitoring, Heart Rate, Step Counting - Slim

In this review the Smart Ring with Sleep Monitoring is evaluated as a compact health tracker for people who want continuous metrics without a bulky wrist device. The biggest reason to buy is its combination of continuous heart rate and blood oxygen monitoring plus automatic activity and sleep tracking in a very light, thin form. It pairs with iPhone and Android, requires no subscription, and offers a long battery life and waterproofing that make it useful for everyday wear and workouts.

Key Features

• Continuous health monitoring: Tracks heart rate and blood oxygen around the clock so users can spot trends and respond to changes in their baseline health.
• Activity tracking: Automatically records steps, distance, calories and routes for running, walking, cycling and other sports for clear workout summaries in the app.
• Sleep analysis: Monitors deep sleep, light sleep and awake time with detailed reports to help adjust habits for better rest.
• Long battery life: Up to five days on a single charge and over 30 days when used with the smart charging case for minimal charging interruptions.
• Durable design: Ultra-thin, lightweight form with IP68/80 m waterproof rating so it can be worn during workouts and swimming.
• No subscription fees: Full functionality in the companion app without recurring charges, including lifetime access to health monitoring features.

Who It's For

This ring is well suited to active adults who prefer a discreet health tracker that stays out of the way while providing continuous sleep tracking and sports metrics. It is also a good fit for anyone who wants compatibility with both iPhone and Android and dislikes subscription models.

It is less appropriate for users who need advanced smartwatch features such as notifications management or a large, interactive display; those users should look to wrist devices. Also, precise medical diagnosis is beyond a consumer wearable, so people requiring medical-grade monitoring should consult a clinician.

Pros & Cons

Pros

• Comfortable, ultra-thin ring design that is easy to wear day and night.
• Robust set of health metrics including heart rate, blood oxygen, steps and sleep without a subscription.
• Good battery performance with extended life when used with the charging case.
• High waterproof rating suitable for swimming and everyday exposure.

Cons

• Requires careful sizing before purchase to ensure a comfortable fit and avoid returns.
• The device provides consumer-grade readings and should not replace professional medical devices.

Specifications

Brand	SARUNN ER
Compatibility	iPhone and Android
Battery life	Up to 5 days; >30 days with charging case
Waterproof rating	IP68 (up to 80 m)
Health sensors	Heart rate, blood oxygen, step counter, sleep tracker
Subscription	No subscription fee

Our Verdict

The SARUNN ER Smart Ring is a strong value for someone seeking a minimalist, all-day health tracker that delivers reliable sleep tracking, continuous heart rate and blood oxygen monitoring without ongoing fees. It excels for active users who want a low-profile device and good battery life, provided they verify their ring size before ordering.

Frequently Asked Questions

Do I need a subscription to use the ring?
The ring does not require any subscription; all features in the companion app are available for life without recurring fees.

How long does the battery last?
The ring lasts up to five days on a single charge and usage time can exceed 30 days when used with the smart charging case.

Is the ring waterproof enough for swimming?
Yes, the device has an IP68 rating and is rated to 80 m, making it suitable for swimming and most water activities.