Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
Oura JZ90-54217-08 Silver, size 8 Ring 4
Available offers (8)
Current
Silver, size 8
Retailer
€310.58
Available to order
Price history by offer
Volatility: MediumFeatures
- Tracks 50+ health metrics
- Smart Sensing technology
- 5-8 day battery life
- All-titanium comfortable design
- 100m water resistance
General specs
- Brand: Oura
- Model: JZ90-54217-08
- Seller: Retailer
- ID: B0D9WVSZ56
- Size: 8
- Brand: Oura
- Model: Ring 4
- Width: 0.9842519675 in
- Height: 0.2755905509 in
- Length: 0.9842519675 in
- Weight: 0.011464037624 lbs
- Display: None
- Sensors: Smart Sensing
- Material: Titanium
- Vibration: None
- AI Advisor: Yes
- Membership: First month free, then $7.99/month
- Battery Life: 5-8 days
- Release Date: 2024-10-15
- Compatibility: Android, iOS
- Health Metrics: Sleep, Activity, Stress, Heart Health, Metabolic Health, Women's Health
- Number of Items: 1
- Water Resistance: Yes
- First listed by seller: March 24, 2025
- Compare the Rings: Oura 4 or Galaxy? Comparison with: Samsung SM-Q509NZDAXAR Titanium Gold Sizing kit for accurate fit
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
Designed for people who value insights over notifications, the Oura Ring 4 serves as your silent health partner. You slip it on and forget it is there while it continuously monitors over 50 metrics, from sleep stages and heart rate to women’s health indicators. Whether you manage a busy household or lead a team at work, the ring delivers data that helps you perform at your peak by revealing patterns you would otherwise miss.
Many trackers record numbers; the Oura Ring clarifies what they mean. Its AI advisor distills complex trends into simple daily guidance—suggesting an early bedtime when your readiness dips or celebrating your recovery after a calm weekend. I noticed the ring picking up my elevated heart rate during a stressful meeting, a detail that led me to incorporate breathing breaks. With five to eight days of battery life, a fit guided by the separate sizing kit, and broad compatibility with iOS and Android, the ring adapts to your life, not the other way around.
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| Brand | Oura | UniJethro | Victormont | RENPHO | Oura | UniJethro |
| Model | JZ90-54217-08 | SR11M | Gen-11 | R-MZW01 | JZ90-1003-06 | SR11M |
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| Price | €310.58 | €35.59 | €88.98 | €177.09 | €299.21 | €35.59 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | May 29, 2026 | Mar 21, 2026 | May 15, 2026 | Mar 21, 2026 | Mar 21, 2026 |
| Size | 8 | 7# | 8 | |||
| Width | 0.9842519675 in | 0.31 inches | 0.71 inches | 0.31 inches | ||
| Height | 0.2755905509 in | 2 inches | 0.12 inches | 2 inches | ||
| Length | 0.9842519675 in | 2 inches | 0.71 inches | 2 inches | ||
| Weight | 0.011464037624 lbs | 0.0881849048 pounds | 0.29 lb | |||
| Battery Life | 5-8 days | 5-7 days | 20 days with wireless charging case | 7 days | 5-7 days | |
| Compatibility | Android, iOS | iOS, Android | iOS, Android | |||
| Waterproof Rating | IP68 | IP68 | IP68 | |||
Oura JZ90-54217-08 Silver Tracks 50+ health metrics
€310.58
When this device makes sense
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