# Samsung Galaxy Watch 4

The Samsung Galaxy Watch 4 (stylized as Samsung Galaxy Watch4) is a smartwatch developed by Samsung Electronics. It is the first Samsung watch to run Google's Wear OS since the Samsung Gear Live, and the first watch to run Wear OS 3, co-developed by Samsung and Google. The device largely followed the design language of the preceding Samsung Galaxy Watch Active and Galaxy Watch 3, but including all new software. The watch also included EKG, body compositional analysis, and blood pressure monitoring via the new Samsung BioActive sensor. It was announced on August 11, 2021, at Samsung's Unpacked Event alongside the Samsung Galaxy Z Flip 3, Samsung Galaxy Z Fold 3 and Galaxy Buds 2. The watch was released worldwide on August 27, 2021.

## Specifications

| Model | Galaxy Watch 4 | Galaxy Watch 4 | Galaxy Watch 4 Classic | Galaxy Watch 4 Classic | Source |
| Size | 40 mm | 44 mm | 42 mm | 46 mm | [1] [2] |
| Part No. | SM-R860 (Wi-Fi) SM-R865 (LTE) | SM-R870 (Wi-Fi) SM-R875 (LTE) | SM-R880 (Wi-Fi) SM-R885 (LTE) | SM-R890 (Wi-Fi) SM-R895 (LTE) | [1] [2] |
| Colors | Black, Green, Pink Gold, Silver | Black, Green, Silver | Black, Silver | Black, Silver | | [1] [2] |
| Display | 1.2" (30.4 mm) | 1.4" (34.6 mm) | 1.2" (30.4 mm) | 1.4" (34.6 mm) | [1] [2] |
| Resolution | 396 x 396 pixels | 450 x 450 pixels | 396 x 396 pixels | 450 x 450 pixels | [1] [2] |
| Glass | Corning Gorilla Glass DX+ | Corning Gorilla Glass DX+ | Corning Gorilla Glass DX | Corning Gorilla Glass DX | | [1] [2] |
| Chassis | Aluminum | Aluminum | Stainless Steel | Stainless Steel | | [1] [2] |
| Processor | Exynos W920 dual-core 1.18 GHz Cortex-A55 | Exynos W920 dual-core 1.18 GHz Cortex-A55 | Exynos W920 dual-core 1.18 GHz Cortex-A55 | Exynos W920 dual-core 1.18 GHz Cortex-A55 | | | [1] [2] |
| Operating System | WearOS (OS 5.0) | WearOS (OS 5.0) | WearOS (OS 5.0) | WearOS (OS 5.0) | | | [1] [2] |
| UI | One UI Watch 6 | One UI Watch 6 | One UI Watch 6 | One UI Watch 6 | | | [1] [2] |
| Size (Excluded the health sensor) | 40.4 mm x 39.3 mm x 9.8 mm | 44.4 mm x 43.3 mm x 9.8 mm | 41.5 mm x 41.5 mm x 11.2 mm | 45.5 mm x 45.5 mm x 11.0 mm | [1] [2] |
| Weight (without strap) | 25.9 g | 30.3 g | 46.5 g | 52.0 g | [1] [2] |
| Strap Size | 20 mm | 20 mm | 20 mm | 20 mm | | | [1] [2] |
| Water Resistance | 5ATM + IP68 / MIL-STD-810G | 5ATM + IP68 / MIL-STD-810G | 5ATM + IP68 / MIL-STD-810G | 5ATM + IP68 / MIL-STD-810G | | | [1] [2] |
| Memory | 1.5 GB RAM + 16 GB flash memory | 1.5 GB RAM + 16 GB flash memory | 1.5 GB RAM + 16 GB flash memory | 1.5 GB RAM + 16 GB flash memory | | | [1] [2] |
| Connectivity | 4G/LTE with eSIM (Galaxy Watch 4 LTE-Version only) Bluetooth 5.0 Wi-Fi a/b/g/n 2.4+5 GHz NFC A-GPS, GLONASS, Beidou, Galileo | 4G/LTE with eSIM (Galaxy Watch 4 LTE-Version only) Bluetooth 5.0 Wi-Fi a/b/g/n 2.4+5 GHz NFC A-GPS, GLONASS, Beidou, Galileo | 4G/LTE with eSIM (Galaxy Watch 4 LTE-Version only) Bluetooth 5.0 Wi-Fi a/b/g/n 2.4+5 GHz NFC A-GPS, GLONASS, Beidou, Galileo | 4G/LTE with eSIM (Galaxy Watch 4 LTE-Version only) Bluetooth 5.0 Wi-Fi a/b/g/n 2.4+5 GHz NFC A-GPS, GLONASS, Beidou, Galileo | | | [1] [2] |
| Sensors | Heart Rate Monitor Blood Oxygen Monitor Electrocardiography (ECG) Blood Pressure Monitor Bioelectrical Impedance Analysis Accelerometer Barometer Gyro Sensor Geomagnetic Sensor Light Sensor | Heart Rate Monitor Blood Oxygen Monitor Electrocardiography (ECG) Blood Pressure Monitor Bioelectrical Impedance Analysis Accelerometer Barometer Gyro Sensor Geomagnetic Sensor Light Sensor | Heart Rate Monitor Blood Oxygen Monitor Electrocardiography (ECG) Blood Pressure Monitor Bioelectrical Impedance Analysis Accelerometer Barometer Gyro Sensor Geomagnetic Sensor Light Sensor | Heart Rate Monitor Blood Oxygen Monitor Electrocardiography (ECG) Blood Pressure Monitor Bioelectrical Impedance Analysis Accelerometer Barometer Gyro Sensor Geomagnetic Sensor Light Sensor | | | [1] [2] |
| Battery | 247 mAh | 361 mAh | 247 mAh | 361 mAh |

## Software

The smartwatch was the first watch released by Samsung to use Wear OS instead of Samsung's own Tizen OS.
This smartwatch is region locked in mainland China, unlike past models.

## Supported languages and regions

Unlike past Wear OS devices, Wear OS 3 supports a wider variety of languages that the end user can choose from. An ADB command can be used to temporarily change the watch's language to another one, which will reset when the device is reconnected to the phone.
Depending on the region where the device was sold from, the language and region options may differ.