| Physical features | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Model | Galaxy Watch (42mm SM-R815U) | Watch 2 (2018) |
| Other model names | Galaxy Watch 42mm (4G LTE) SM-R815UZDAXAR, Samsung Galileo | Huawei Watch2 2018 e-sim, Huawei Leo |
| Country or region available | 
USA | 
China |
| Brand | Samsung | Huawei |
| Release date | August, 2018 | May, 2018 |
| Depth | 12.7 millimeters (0.5 inches) | 12.6 millimeters (0.5 inches) |
| Size (width x height) | 41.9 x 45.7 millimeters (1.65 x 1.8 in) | 45 x 48.9 millimeters (1.77 x 1.93 in) |
| Weight | 49 grams (1.72 ounces) | 57 grams (2 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Internal antenna | Internal antenna |
| Build, materials | Stainless steel body, glass front | Plastic body, glass front |
| Protection against water and others | 50 meters waterproof.
MIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant. | IP68 certified: dust proof and waterproof over 1.5 meter and 30min |
| System (OS) | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Operating system | Tizen 4.0 | Android Wear 2.0 (7.1.1 Nougat) |
| Firmware update | feature not registered | Android Wear 2.1 (8.0 Oreo) |
| Hardware | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Chipset | 64bit - Samsung Exynos 9 Dual 9110 (10nm) | 32bit - Qualcomm Snapdragon Wear 2100 MSM8909w (28nm) |
| CPU processor | 1.15Ghz Dual-Core ARM Cortex-A53 | 1.1Ghz Quad-Core ARM Cortex-A7 |
| GPU graphical controller | ARM Mali-T720 MP1 | Qualcomm Adreno 304 |
| RAM memory | 1.5GB LPDDR3 | 768MB LPDDR3 |
| Internal storage | 4GB (1.5GB available)
eMMC | 4GB (2GB available) |
| External storage | Not supported | Not supported |
| Display | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Display type | Super AMOLED | AMOLED |
| Screen size | 1.2" inches | 1.2" inches |
| Screen-to-body ratio | ~24.3% (screen-to-body ratio) | ~21.1% (screen-to-body ratio) |
| Display resolution | 360x360 pixels (1:1) | 390x390 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 424 PPI | 460 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass DX+ | Gorilla Glass |
| Display features | Not supported | feature not registered |
| Mobile networks | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Dual-SIM | Not supported | Not supported |
| SIM card | 1 slot (Single-SIM)
e-SIM (Eletronic) | 1 slot (Single-SIM)
nano-SIM (4FF) |
| Maximum download/upload | 10 Mbps | 150/50 Mbps |
| Network technology | 3G, 4G | 2G, 3G, 4G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM Mhz band | Not supported | Dual-Band 900/1800 |
| Primary 2G network | Not supported | GSM 900/1800 |
| Primary 3G network | UMTS 850/1700/1900 | TD-SCDMA 1900/2000
UMTS 900/1900/2100 |
| Primary 4G network | LTE (Bands 2,4,5,12,13,25,26,66) | LTE Cat4 (Bands 1,3,7,8)
TD-LTE (Bands 39,41) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | UMTS, HSDPA, HSUPA, HSPA+, LTE | GPRS, EDGE, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
| Calling | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS, E-mail |
| Speakerphone | Supported | Supported |
| Video calling | Not supported | Not supported |
| Call control | Voice dialing, Voice recorder, Voice commands | Voice dialing, Voice recorder, Voice commands |
| Camera | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Back camera (main camera) | Not supported | Not supported |
| Main camera resolution | Not supported | Not supported |
| Video recording (primary) | Not supported | Not supported |
| Flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Not supported | Not supported |
| Touch focus | Not supported | Not supported |
| Image stabilization | Not supported | Not supported |
| Zoom | Not supported | Not supported |
| Face/smile detection | Not supported | Not supported |
| BSI sensor | Not supported | Not supported |
| HDR | Not supported | Not supported |
| 2ª camera | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Front camera (secondary) | Not supported | Not supported |
| Front camera resolution | Not supported | Not supported |
| Video recording (secondary) | Not supported | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Multimedia | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4 | feature not registered |
| Audio formats | MP3, WAV, WMA, OGG, eAAC+ | MP3, WAV, eAAC+, FLAC |
| Connectivity | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| USB | Not supported | Not supported |
| TV output | Not supported | Not supported |
| Audio output | Not supported | Not supported |
| Bluetooth | 4.2 + A2DP | 4.1 + A2DP |
| WiFi | 802.11 b/g/n (2.4Ghz) | 802.11 b/g/n (2.4Ghz) |
| DLNA | Not supported | Not supported |
| NFC | Supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS |
| Infrared port | Not supported | Not supported |
| Other functions | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Active noise cancellation | Not supported | Not supported |
| Vibrating alert | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | Not supported | Not supported |
| Sensors | Accelerometer
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
| Accelerometer
Compass
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
|
| Other features | - Colors: Midnight Black, Rose Gold
- Straps: Black, Grey, Red, Yellow, Purple, Pink, Brown
- Compatible with standard 20mm straps
- Always-on display
- Rotating bezel
- Samsung Pay
- Compatible with Sprint, T-Mobile and Verizon carriers | - Colors: Carbon Black
- Google Assistant
- Workout data report
- Compatible with standard 20mm straps |
| Power supply | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| Battery | Li-Ion: Lithium-Ion (Non removable) | Li-Ion: Lithium-Ion (Non removable) |
| Battery capacity | 270 mAh | 420 mAh |
| Charger, watts | 3.5W (5V/0.7A) Standard charging
Qi wireless charging | Standard charging
Magnetic charging (dock) |
| Talk time autonomy | feature not registered | feature not registered |
| Standby | 4320 minutes | 72 hours | 3 days | feature not registered |
| Radiation rate | Samsung Galaxy Watch (42mm SM-R815U) | Huawei Watch 2 (2018) |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.961W/kg (head) | 1.786W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |