R13 SIZE 8 Smart Ring: Heart rate detection
Available Options
Meet the R13 SIZE 8 Smart Ring—your new high-tech sidekick that's all about keeping you in the loop on your health and fitness. Packed with advanced sensors, it's like having a mini health lab on your finger, offering everything from heart rate and blood oxygen checks to blood pressure monitoring. And because we know you love a good multitasker, it also throws in temperature tracking, the ability to snap photos from afar, and even motion-sensing games to keep things interesting.
But wait, there's more (because of course there is):
- Whether you're running, swimming, or just trying to remember if you moved today, its multiple sport modes have got you covered.
- It keeps tabs on your sleep, because let's face it, we could all use a little more quality shut-eye.
- Counts your steps and syncs them straight to your APK/APP, because bragging rights are important.
Durability? Check. With a 5ATM waterproof rating, it laughs in the face of rain (and showers, and probably even your tears after seeing your step count). Plus, it boasts a 3-5 day battery life and comes with a magnetic charging cable because fumbling with cords is so last decade. Compatible with Android 6.0 or above and iOS 11.0 or above, it's pretty much ready to roll with whatever gadget you've got.
- Blood oxygen test
- Sleep monitoring
- Motion-sensing game
- Multiple sport modes
- Temperature measurement
- Heart rate detection
General specs
- Model: R13 SIZE 8
- 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 18.2mm; Perimeter 57mm
- 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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| Brand | Mystic Mart | Delcast | Delcast | GLOBUS | Actually lighting | |
| Model | R13 SIZE 8 | |||||
| Color | ||||||
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| Price | $14.50 | $58.02 | $55.99 | $55.99 | $41.80 | $96.14 |
| Seller | Sunsky | Joom | Amazon | Amazon | Joom | Joom |
| Update | September 16, 2025 | August 24, 2025 | July 20, 2025 | July 19, 2025 | August 30, 2025 | August 23, 2025 |
| Waterproof | 5ATM | Yes | 5ATM | |||
