R13 SIZE 13 Smart Ring: Heart rate detection
Meet the Smart Ring—your new favorite gadget that’s way more than just a pretty piece of tech. Packed with all the bells and whistles (literally, if you count the alerts), it’s like having a mini health lab on your finger. From keeping tabs on your heart rate to playing detective with your blood oxygen levels and even giving you the lowdown on your blood pressure, this ring’s got you covered. And for those who like to sweat it out, it’s got multiple sport modes because, let’s face it, not all workouts are created equal.
Ever wondered why you’re still tired after what felt like a full night’s sleep? The ring’s sleep monitoring function is here to spill the beans on your nighttime habits. But it’s not all serious business—there’s fun to be had with motion-sensing games and gesture interaction that’ll make you feel like a wizard. Plus, it plays nice with both Android (6.0 and up) and iOS (11.0 and up), syncing your data without a hitch.
Rain or shine, swim or shower, its 5ATM waterproof rating means it’s tough enough to handle whatever your day throws at it. And yes, it comes with all the essentials: the smart ring itself, a charging cable (because it’s not magic), a user manual (for those who read them), and the original box (for the unboxing enthusiasts).
- Blood oxygen test
- Sleep monitoring
- Motion-sensing game
- Multiple sport modes
- Temperature measurement
- Heart rate detection
General specs
- Model: R13 SIZE 13
- Seller: Sunsky
- Main Chip: OM6626A
- Bluetooth: 5.3
- Sensor chip: SC7A20H
- Heart rate sensor: HX3918
- Battery Capacity: 16mAh
- Working Time: 3-5 days
- Charging time: About 2H
- Waterproof: 5ATM
- Size: Dia 22.3mm, Perimeter 70mm
- Charging method: Magnetic charging
- Compatible system: Android6.0 or above, iOS11.0 or above
- APP: ECTRI
- First listed by seller: 7/23/25
If you are interested in more details, you can find full information on the seller's page.
Shipping options
United States
Video Reviews
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| This item | Recommendations | |||||
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Smart Ring Heart rate detection
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Smart Fitness Tracker Ring
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| Brand | Delcast | Actually lighting | HitTopss | Twievo | ||
| Model | R13 SIZE 13 | R09 SIZE 9 | ||||
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| Price | $14.50 | $15.41 | $55.99 | $79.43 | $29.99 | $39.99 |
| Seller | Sunsky | Sunsky | Amazon | Joom | Amazon | Amazon |
| Update | August 26, 2025 | August 23, 2025 | July 20, 2025 | August 23, 2025 | June 27, 2025 | July 18, 2025 |
