SARUNN ER Smart Ring with Sleep Monitoring: Diverse health monitoring modes
The SARUNN ER Smart Ring is like having a tiny, hyper-observant health coach wrapped around your finger. It’s not just counting your steps—oh no. This little guy is tracking your heart rate, blood oxygen, and even your blood pressure around the clock. Whether you’re crushing a workout or just trying to remember to move your legs from the couch to the fridge, it’s got your back. And your sleep? It’s on that too, breaking down your snooze time into deep and light sleep like a sleep scientist who’s way too invested in your REM cycles. With a battery that laughs in the face of your phone’s pathetic life span (up to 5 days, or a whopping 30 with the charging case), a design so light you’ll forget it’s there, and the ability to dive 90 meters underwater without breaking a sweat, it’s basically the James Bond of fitness trackers. And the best part? No sneaky subscription fees—just you, your health data, and the SARUNN app, living happily ever after.
- Intelligent sleep tracker
- Long battery life
- Ultra-thin design
- 90-meter waterproof
- No subscription fees
- Diverse health monitoring modes
General specs
- Brand: SARUNN ER
- Seller: Amazon
- package_dimensions: 3.62 x 3.62 x 1.22 inches
- item_weight: 3.2 ounces
- batteries: 1 A batteries required. (included)
- standing_screen_display_size: 0.1 Inches
- waterproof_depth: 90 meters
- battery_life: 5 days, 30 days with charging case
- First listed by seller: 8/5/25
If you are interested in more details, you can find full information on the seller's page.
Buy on Amazon
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$17.59
Last price update: 8/5/25
Available to order
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Delivery to 
United States
United States
Available
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| Brand | SARUNN ER | Aichiken | Aichiken | Domhong | Generic | HitTopss |
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| Price | $17.59 | $65.99 | $65.99 | $42.99 | $55.98 | $29.99 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | August 5, 2025 | June 27, 2025 | June 27, 2025 | June 27, 2025 | June 27, 2025 | July 19, 2025 |
| package_dimensions | 3.62 x 3.62 x 1.22 inches | 3 x 3 x 1 inches | 3 x 3 x 1 inches | 4.02 x 3.11 x 1.26 inches | 3.07 x 2.91 x 1.73 inches | |
| item_weight | 3.2 ounces | 2.39 ounces | 2.39 ounces | 3.2 ounces | 2.89 ounces | |
| batteries | 1 A batteries required. (included) | 1 Lithium Ion batteries required. (included) | 1 Lithium Ion batteries required. (included) | 1 Nonstandard Battery batteries required. (included) | 1 Lithium Polymer batteries required. (included) | |
| memory_storage_capacity | 4 MB | 4 MB | 512 KB | 64 MB | ||
| country_of_origin | China | China | China | |||
| date_first_available | April 2, 2025 | April 21, 2025 | December 25, 2024 | |||
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