R04 Smart Ring: Heart rate monitoring
Meet the Smart Ring—your new favorite gadget that’s way more than just a pretty piece of tech. Packed with a Jeri chipset and Bluetooth 5.4, it’s like having a super-fast, always-on connection right on your finger. And thanks to the STK8321-W sensor chip, it’s got your back (or rather, your heart) with spot-on health stats like heart rate, blood oxygen, and even HRV variability. Because who doesn’t want to know if their heart’s throwing a party or just chilling?
Worried about battery life? Don’t be. With a 15mAh battery (or 18mAh if you’ve got bigger fingers—size 9 and up, we see you), you’re looking at up to 7 days of use. Or, if you’re the type to forget to charge things (no judgment), it’ll last 15 days just hanging out on standby. And when it’s time to power up, a quick 1.5-hour magnetic charge is all it takes. Plus, it’s waterproof up to 5ATM, so go ahead, wear it in the shower or while you’re pretending to swim laps.
Whether you’re team Android 5.1+ or iOS 8.0+, this ring plays nice with both. The QRing app (yes, it’s as cool as it sounds) lets you track your daily hustle, keep an eye on your health, and even snap pics from afar—because sometimes you just need to be in the photo without holding the phone. And when it arrives, you’ll find the smart ring, a charging cable, a user manual (for those who read them), and the original box—because unboxing is half the fun.
Features
- Blood oxygen saturation
- Sleep tracking
- Step count
- Multiple exercise modes
- Remote photo control
- Heart rate monitoring
General specs
- Model: R04
- Seller: Sunsky
- ID: 3788968
- Chipset: Jeri
- Bluetooth: 5.4
- Sensor chip: STK8321-W
- Battery Capacity: 15mAh (18mAh for size 9 and above)
- Battery Life: 5-7 days of use, 15 days of standby
- Charging Time: around 1.5 hours
- Waterproof: 5ATM
- Size: Dia 17.5mm, Circumference 55mm
- Charging Method: Magnetic charging
- Compatible system: Android5.1 or above, iOS8.0 or above
- APP: QRing
- First listed by seller: 5/9/25
If you are interested in more details, you can find full information on the seller's page.
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Smart Ring Heart rate monitoring
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Smart Ring Health Tracker Comprehensive health monitoring
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Smart Ring Advanced Health Tracking
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Domhong R03 Silver No app subscription required
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BUDAOLIU BD-SM-R6 Silver Sleep tracking
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| Brand | VNEXFU | MUNBYN | SARUNN ER | Domhong | BUDAOLIU | |
| Model | R04 | R03 | BD-SM-R6 | |||
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| Price | $10.18 | $29.99 | $69.99 | $22.80 | $29.99 | $29.99 |
| Seller | Sunsky | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | May 8, 2025 | Jul 20, 2025 | Dec 6, 2025 | Dec 6, 2025 | Dec 6, 2025 | Jun 27, 2025 |
| Battery Life | 5-7 days of use, 15 days of standby | Up to 7-Day | 5 days, 30 days with charging case | 5–7 d | ||
| Size | Dia 17.5mm, Circumference 55mm | 10 | 10 | |||
