R13 Size 12 Smart Ring: Heart rate detection
Meet the R13 Smart Ring—your new fitness buddy that's as versatile as you are. Whether you're crushing your workout or just trying to remember what REM sleep feels like, this little gadget's got your back (and your wrist). It's packed with all the health-tracking goodies you'd expect, like heart rate detection and blood oxygen tests, plus it'll even keep an eye on your blood pressure. And because we know you're curious, it also checks your temperature and how well you're sleeping—because let's face it, we could all use a little more of that.
But wait, there's more! It's not just about health; it's about fun too. With a motion-sensing game and multiple sport modes, it turns fitness into a game (literally). And thanks to its waterproof (5ATM) design, you can wear it in the shower, pool, or even during that impromptu rain dance—no worries. Plus, with a working time of 3-5 days on a single charge, it's ready when you are, no constant charging required.
Compatible with Android 6.0 or above and iOS 11.0 or above, it syncs up with your phone smoother than your favorite playlist. So, whether you're team Android or iOS, you're good to go. Just strap it on, and let the data do the talking.
Features
- Blood oxygen test
- Sleep monitoring
- Motion-sensing game
- Multiple sport modes
- Temperature measurement
- Heart rate detection
General specs
- Brand: R13
- Model: Size 12
- Seller: Sunsky
- ID: 3893641
- 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 21.5mm; Perimeter 67.5mm
- 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
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| Brand | R13 | VNEXFU | MUMUCREAM | SARUNN ER | MUNBYN | UPDEI |
| Model | Size 12 | R6 | ||||
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| Price | $14.50 | $29.99 | $51.99 | $22.80 | $69.99 | $59.99 |
| Seller | Sunsky | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | Mar 2, 2026 | Jul 20, 2025 | Nov 9, 2025 | Dec 6, 2025 | Dec 6, 2025 | Aug 5, 2025 |
| Package Dimensions | 3.07 x 2.99 x 1.93 inches | 3.62 x 3.62 x 1.22 inches | 3.1 x 2.8 x 1.97 inches | |||
| Item Weight | 4.2 ounces | 3.2 ounces | 3.2 ounces | 76 Grams | ||
| batteries | 1 AA batteries required. (included) | 1 A batteries required. (included) | Nonstandard Battery batteries required. | 1 AAA batteries required. (included) | ||
| Country of Origin | China | China | China | |||
| Standing Screen Display Size | 1 Centimeters | 0.1 Inches | 12 Millimeters | 9 Centimeters | ||
