Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
Oura JZ90-54218-11 Stealth, size 11 Ring 4 - Stealth - Size 11
Available offers (8)
Current
Stealth, size 11
Retailer
€310.58
Available to order
Price history by offer
Volatility: MediumFeatures
- Tracks 50+ health metrics accurately
- Unique sizing requires sizing kit
- 5-8 days battery life
- First month membership included
- All-titanium comfortable design
General specs
- Brand: Oura
- Model: JZ90-54218-11
- Seller: Retailer
- ID: B0D9WWHXHH
- Brand: OURA
- Model: 4
- Width: 0.9842519675 inches
- Height: 0.3149606296 inches
- Length: 0.9842519675 inches
- Display: None
- Material: Titanium
- Ring Size: 11
- Vibration: None
- Membership: First month free, then $7.99/month
- Sizing Kit: Oura Ring 4 Sizing Kit
- Battery Life: 5 to 8 days
- Release Date: 2024-10-15
- Package Quantity: 1
- Water Resistance: Yes
- Sensing Technology: Smart Sensing
- Requires Sizing Kit: Yes
- Health Metrics Tracked: Sleep, Activity, Stress, Heart Health, Metabolic Health, Women's Health
- Number of Tracked Metrics: 50+
- Compatible Operating Systems: Android, iOS
- First listed by seller: July 19, 2025
If you are interested in more details, you can find full information on the seller's page.
Price History for seller Retailer
Shipping options
Delivery to 
United States
United States
Available
Oura Ring 4 gives you a clear picture of your health, from sleep and activity to stress and heart health. It’s designed for people who want feedback without being tethered to a screen. You slip it on, forget it’s there, and let it work in the background.
Over time, the ring becomes more than a sleep tracker. It learns your normal baselines and flags small changes before they become problems. One user noticed their body temperature trending higher two nights in a row. The next day, they felt a cold coming on. That early alert let them rest and recover faster.
The battery lasts up to 8 days, and the all-titanium body feels weightless, even during a workout. Pair it with the Oura App, where the AI Advisor turns your data into simple, daily guidance. You start with a free month of membership, then continue for $7.99 a month if you choose. No buzzing, no screen, just knowing.
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| Brand | Oura | Kuxlagz | SEEKZERO | TIAZUUX | UniJethro | Victormont |
| Model | JZ90-54218-11 | Smart Ring | SR11M | Gen-11 | ||
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| Price | €310.58 | €62.28 | €62.28 | €53.39 | €35.59 | €88.98 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Mar 21, 2026 | Mar 21, 2026 | Mar 21, 2026 | May 3, 2026 | Mar 21, 2026 | Mar 21, 2026 |
| Battery Life | 5 to 8 days | 5-7 days | 20 days with wireless charging case | |||
| Item Weight | 0.5 Ounces | 2.9 Grams | 5.3 ounces | |||
| Package Dimensions | 3.35 x 3.27 x 1.73 inches | 3.54 x 3.15 x 1.49 inches | 3.98 x 3.94 x 1.85 inches | |||
Oura JZ90-54218-11 Stealth Tracks 50+ health metrics accurately
€310.58
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