Circular Ring 2 Smart Ring at CES: What It Is

The Circular Ring 2 is a smart ring revealed at CES 2025 that adds a display around the inner band, letting you see notifications and basic health data without opening an app. You wear it like a normal ring, and it tracks sleep, heart rate, and activity while showing small text and icons on its inner screen. This article explains what the ring does, how the display works, how it compares to other smart rings, and what to consider before buying one.

What the Circular Ring 2 Actually Does

The Circular Ring 2 is a health-and-notification wearable that fits on your finger. It tracks sleep stages, heart rate, heart rate variability, skin temperature, and blood oxygen (SpO2) during sleep. During the day, it counts steps, calories, and active minutes. The unique feature is the inner display: a circular screen on the inside of the band that shows a small message, a timer, or a heart-rate readout when you touch the outer surface. The display is not a touchscreen; you interact by tapping the outer edge or using the accompanying app.

The ring also has a vibration motor for silent alarms and notifications. It works with the Circular app (iOS and Android) and can mirror notifications from your phone, like incoming calls or texts. The ring is water-resistant (IPX8, so it can be worn while swimming) and has a battery that lasts about 4-5 days, depending on use. It charges in a small pod that you place the ring into.

How the Inner Display Works

The inner display is a low-power OLED screen that wraps around the inside of the band. Because it is on the inner surface, you read it by turning your palm toward your face. The ring uses a sensor on the outer side to detect a tap, which turns on the display for a few seconds. The screen shows small text messages, icons, and numbers—limited to about 10 characters per line. It cannot show full notifications or images; it is meant for quick glances.

The display is always off to save battery, and it only lights up when you tap or when an alarm goes off. This design avoids the constant-on screen of a smartwatch, which is why the battery lasts several days despite having a screen.

Comparing to Other Smart Rings (Oura, Samsung Galaxy Ring)

The main competitors are the Oura Ring (Gen 3 and Gen 4) and the Samsung Galaxy Ring. Here is a quick comparison:

• Display: Circular Ring 2 has an inner display; Oura and Galaxy Ring have no display at all—they rely entirely on the phone app.
• Subscription: Circular Ring 2 does not require a monthly subscription; Oura charges a monthly fee for detailed insights. Samsung Galaxy Ring also has no subscription, but some advanced features require a Samsung phone.
• Sensors: All three track heart rate, sleep, and activity. Circular Ring 2 adds SpO2 and skin temperature; Oura and Galaxy also track those.
• Battery: Circular Ring 2 lasts 4-5 days; Oura Gen 3 lasts about 7 days; Galaxy Ring lasts about 7 days (varies by size).
• Compatibility: Circular Ring 2 works with both iOS and Android; Galaxy Ring works best with Samsung phones but also works with other Android phones via the Galaxy Wearable app; Oura works with both.

The Circular Ring 2’s display is its main differentiator. If you want to see notifications without pulling out your phone, it is the only option among these three.

How to Choose the Right Ring Size

Getting the correct ring size is critical because the ring must fit snugly but not too tight. The company sells a sizing kit (a set of plastic rings) to try before you order. If you are between sizes, choose the larger one for comfort, especially if you plan to wear it during sleep.

Common Problems and Limitations

• Display readability: The inner display is small and can be hard to read in bright sunlight; you need to angle your hand just right.
• Battery life: 4-5 days is shorter than many smart rings, and the charging pod is easy to misplace.
• Limited notifications: You cannot reply to messages or see full text; it is only a glanceable alert.
• Finger swelling: If your fingers swell during sleep or exercise, the ring may feel tight and leave marks.
• Accuracy: Optical heart-rate sensors on fingers are generally accurate, but they can be affected by movement or poor fit. No wearable is a medical device.

Cost and Availability

The Circular Ring 2 was announced at CES 2025 with a retail price around $380 (USD). It was initially available through a crowdfunding campaign (Indiegogo) with early-bird pricing around $280, and later through the company’s website. As of early 2025, it is shipping to backers and is expected to be widely available in mid-2025. Prices may vary by region and currency. There is no monthly subscription, which is a plus compared to Oura.

Safety and Health Considerations

Smart rings are not medical devices and should not be used to diagnose or treat any condition. The SpO2 and heart-rate data are for general wellness only. If you have a pacemaker or other implantable device, consult your doctor before wearing a smart ring, as the sensors and magnets may interfere. Also, the ring contains a battery and electronics, so it should be removed before MRI scans. The ring is water-resistant but not designed for deep diving; avoid wearing it in hot tubs or saunas for extended periods.

Alternatives to Consider

• Oura Ring Gen 4: No display, but excellent sleep tracking and a proven app. Requires a subscription for full insights.
• Samsung Galaxy Ring: No display, works best with Samsung phones, has a sleep coaching feature.
• Smartwatches (Apple Watch, Galaxy Watch): They have full displays and more features, but are bulkier and need daily charging.
• No wearable: If you only want sleep tracking, you can use a smartphone app that tracks movement on your bed (though less accurate).

Frequently Asked Questions

Is the Circular Ring 2 waterproof?
Yes, it has an IPX8 rating, meaning it can be submerged in water up to 1.5 meters for 30 minutes. You can swim with it, but it is not for scuba diving.

Does the Circular Ring 2 work with iPhone and Android?
Yes, it works with both iOS (iPhone 8 and later) and Android (Android 8.0 and later) via Bluetooth. The app is available on both stores.

Can you see notifications on the ring?
Yes, you can see a small text preview of incoming calls, texts, and app notifications. You cannot reply or interact beyond tapping to dismiss the alert.

How long does the battery last?
About 4-5 days with normal use. The charging pod takes about 1.5 hours to fully charge the ring.

Is there a monthly subscription?
No, the Circular Ring 2 does not require a subscription. All features are included in the purchase price.

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