Oppo Watch S2 vs Xiaomi Watch S5 specs comparison

The Watch S2 is slimmer and puts more emphasis on health features such as ECG, wrist temperature and FatMax. Xiaomi counters with substantially longer battery life, making the Watch S5 46mm the stronger option if charging frequency matters more than OPPO's extra health and fitness tools.

Full comparison

The full record

76 specifications across 6 areas, with 29 genuine differences.

1. Design & display 8 differences · Xiaomi Watch S5 46mm leads on Display size, Display resolution +1 Xiaomi Watch S5 46mm
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
Release date
2026-09-22
2026-05
Physical size
8.9 mm thick
46 mm diameter x 10.99 mm thick
Weight
34.4 g without strap
43.5-45.7 g depending on version
Material
Stainless steel middle frame; PA + glass-fibre reinforced rear shell
316L stainless steel middle frame; stainless steel, ceramic or forged-carbon bezel depending on version
Water resistance
5 ATM
5 ATM
Display type
AMOLED
AMOLED
Display size
1.46 inch
1.48 inch
Display resolution
464 x 464 pixels, 317 ppi
480 x 480 pixels, 323 ppi
Display brightness
600 nits typical; 1,500 nits outdoors; up to 3,000 nits in supported workout modes
Up to 2,500 nits
Display protection
Glass
2D flat tempered glass
2. Battery & charging 4 differences · Xiaomi Watch S5 46mm leads on Battery life Xiaomi Watch S5 46mm
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
Battery
Rechargeable battery; 339 mAh typical; 330 mAh rated
Rechargeable battery; 815 mAh (Xiaomi Surge Battery)
Battery life
Up to 10 days in long-battery mode; up to 7 days with typical use; up to 4 days with AOD
Up to 21 days light use; 14 days normal use; 9 days AOD normal use
Charging
Integrated magnetic watch charging cable
Magnetic USB charging dock
Charging time
90 minutes
About 90 minutes
3. Sensors & positioning 3 differences · Oppo Watch S2 leads on Electrical heart rate, Temperature Oppo Watch S2
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
GNSS type
Built-in dual-band L1+L5 GNSS
Built-in dual-band GNSS
GPS
Yes
Yes
GALILEO
Yes
Yes
GLONASS
Yes
Yes
QZSS
Yes
Yes
Beidou
Yes
Yes
Accelerometer
Yes
Yes
Gyroscope
Yes
Yes
Barometric altimeter
Yes
Yes
Compass
Yes
Yes
Geomagnetic
Yes
Yes
Ambient light sensor
Yes
Yes
Optical heart rate
Yes (upgraded optical sensor; 75% better interference resistance claimed)
Yes
Electrical heart rate
Yes (China model)
No
SpO2
Yes
Yes
Temperature
Yes
No
Galvanic skin response
No
No
Microphone
Yes
Yes
Speakers
Yes
Yes
Vibration motor
Yes
Yes
4. Health & activity 4 differences · Oppo Watch S2 leads on Floors, Respiration rate +2 Oppo Watch S2
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes (includes FatMax estimated fat burned in grams)
Yes
Floors
Yes
No
Sports tracking
Yes (100+ sports modes; FatMax on 16+ activities; 65+ strength exercises recognised)
160+ workout modes
Sleep
Yes (includes sleep apnoea risk assessment on China model)
Yes
Heart rate
Yes
Yes
HRV
Yes (used in AI workout-readiness analysis)
Yes
Stress
Yes
Yes
Blood oxygen
Yes
Yes
Respiration rate
Yes
No
Skin temperature
Yes
No
ECG
Yes (China model)
No
Blood pressure
No
No
Body composition
No
No
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
No
No
5. Smart features 6 differences · no clear overall edge No clear edge
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
Smartphone compatibility
Android and iOS (China model; Android + Android and Android + iPhone dual-phone combinations supported)
Android and iOS
Operating system at launch
ColorOS Watch 17.0.0
Xiaomi HyperOS
Bluetooth
Yes
Yes
Wi-Fi
No
Yes (fast transfer for music and offline maps)
NFC / connected pay
Yes (unencrypted access cards; regional support varies)
Yes (availability varies by region)
UWB
No
No
Cellular
No
No
Smartphone notifications
Yes (supports dual-phone pairing)
Yes
Bluetooth calling
Yes
Yes
Smartphone music control
Yes
Yes
On-board music storage
Yes
Yes
Voice assistant
Xiaobu Assistant (China)
No
6. Navigation & safety 4 differences · Xiaomi Watch S5 46mm leads on Offline maps, Emergency SOS Xiaomi Watch S5 46mm
Fact
Oppo Watch S2
Xiaomi Watch S5 46mm
Maps
Yes
Yes
Offline maps
No
Yes
Navigation
Yes (phone-linked navigation information via Fluid Cloud)
Yes (offline maps, route guidance and retrace route)
Emergency SOS
No
Yes (phone-assisted emergency contact)
Satellite SOS
No
No
Fall detection
Yes
Yes (skiing safety feature)
LED flashlight
No
No
Diving
No
No

Individual specifications

These technical specs are correct to the best of our knowledge at the time of publishing.