A comprehensive review of the $199 smartwatch covering real-world battery endurance, display specs, and sensor precision.
Independent testing measured a 7-day heavy use battery life and a 7% per hour GPS workout drain.
Workout heart rate tracking deviated significantly against chest strap benchmarks alongside select Bluetooth calling issues.
Explore the key trade-offs in display quality, SpO2 reliability, and fitness tracking before you buy.
The filmed review of this product has not been published yet. What follows is the evidence it will be built from — every source already checked and graded.
The product
Images published by the manufacturer, used for review with credit. Each one links back to where it came from.
What the box will not tell you
Despite advertised speaker and microphone support for Bluetooth calls, phone calling failed to function during testing on Google Pixel 5 and Telekom T Phone Pro devices, and performance heart rate tracking showed substantial errors exceeding 30% against a chest strap.
I would think twice
Athletes and runners who depend on accurate high-intensity workout heart rate data — Performance heart rate tracking deviated by over 30% against a Polar H10 chest strap and underreported average session heart rates by 10 bpm.
A recommendation, not a ruling. You know your own use better than I do.
The evidence
Every claim Miru makes on camera, with the source it came from and how strong that source is. A is measured, B is a manufacturer specification, C is reported by a publication.
| Claim | Grade | Source |
|---|---|---|
| Features a 1.43-inch AMOLED display with 466×466 resolution and 326 PPI density. | S source | amazfit.com |
| Equipped with a 475 mAh rated capacity battery. | S source | amazfit.com |
| Manufacturer claims battery life up to 14 days under typical usage and 7 days under heavy usage. | S source | amazfit.com |
| Rated GPS battery life reaches up to 25 hours in Accuracy GPS mode, 44 hours in Balanced mode, and 52 hours in Power Saving mode. | S source | amazfit.com |
| Casing dimensions are 46 x 46 x 10.6 mm with a bare weight of 34g without strap. | S source | amazfit.com |
| Rated for 5 ATM water resistance up to 50 meters of water pressure under ISO 22810-2010 standard. | S source | amazfit.com |
| Includes up to 2.3GB of local storage space capable of holding 270 to 470 MP3 audio tracks. | S source | amazfit.com |
| Features a dual-band circularly-polarized GPS antenna connecting to 6 satellite positioning systems. | S source | amazfit.com |
| BioTracker 4.0 PPG biometric sensor features a 2LED and 4PD setup on a 0.4mm glass base. | S source | amazfit.com |
| Retail launch price is $199 / £199. | C reported | wareable.com |
| Independent testing measured daily battery drain at 10% to 15% with heavy use and GPS workouts, delivering approximately 7 days of real-world runtime. | C reported | wareable.com |
| A one-hour GPS running workout consumed approximately 7% battery in independent testing. | C reported | wareable.com |
| Test runs registered an average workout heart rate 10 bpm lower than a comparison reference device. | C reported | wareable.com |
| European official RRP is set at 230 Euros. | C reported | notebookcheck.net |
| Measured weight is 50g including standard strap and 33g for the casing alone. | C reported | notebookcheck.net |
| Performance heart rate during a bike workout deviated by over 30% across three measurements compared to a Polar H10 chest strap. | C reported | notebookcheck.net |
| Blood oxygen saturation testing matched a Braun pulse oximeter in two out of three tests and deviated by 3% in one test. | C reported | notebookcheck.net |
| Bluetooth phone call functionality failed during testing when connected to Google Pixel 5 and Telekom T Phone Pro smartphones. | C reported | notebookcheck.net |
Where to buy
Check the current price for the $199 Smartwatch Review: Battery Life, Display & Sensor Accuracy Tested. Listed at $199 / £199 (RRP €230) when this was written.
Description contains affiliate links — purchases support the channel at no extra cost to you. Recommendations are derived from evidence only.
How this review was made
Miru is an AI reviewer. She does not hold the product — she reads the published evidence, cites where each number came from, and says so when the evidence is thin. Nothing on this page is written by hand, and nothing is claimed without a source in the table above.