Oppo Watch S2 vs Watch S specs comparison
The Watch S2 is the better choice if you want the newer fitness features, particularly FatMax, improved heart-rate sensing and expanded strength tracking. Otherwise, the two watches are remarkably similar in display, size, GPS and battery life, so Watch S owners have little reason to rush into an upgrade.
Full comparison
The full record
79 specifications across 6 areas, with 13 genuine differences.
1. Design & display Mixed
Fact
Oppo Watch S2
Oppo Watch S
Release date
2026-09-22
2025-10-16
Physical size
8.9 mm thick
44.98 x 44.98 x 8.9 mm
Weight
34.4 g without strap
35 g without strap
Material
Stainless steel middle frame; PA + glass-fibre reinforced rear shell
Stainless steel middle frame; PA + 55% glass-fibre rear shell
Water resistance
5 ATM
5 ATM; IP68
Color options
Mountain Shadow Grey, Vibrant Orange, Misty Powder
Phantom Black, Silver Gleam
Display type
AMOLED
AMOLED
Display size
1.46 inch
1.46 inch
Display resolution
464 x 464 pixels, 317 ppi
464 x 464 pixels, 317 ppi
Display brightness
600 nits typical; 1,500 nits outdoors; up to 3,000 nits in supported workout modes
Up to 3,000 nits
Display protection
Glass
Glass
2. Battery & charging Even
Fact
Oppo Watch S2
Oppo Watch S
Battery
Rechargeable battery; 339 mAh typical; 330 mAh rated
Rechargeable battery; 339 mAh typical; 330 mAh rated
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 10 days in long-battery mode; up to 7 days with typical use; up to 4 days with AOD
Charging
Integrated magnetic watch charging cable
Integrated magnetic watch charging cable
Charging time
90 minutes
90 minutes
No significant differences in this area.
3. Sensors & positioning No clear edge
Fact
Oppo Watch S2
Oppo Watch S
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)
Yes (China model); not listed on current global specification
SpO2
Yes
Yes
Temperature
Yes
Yes
Galvanic skin response
No
No
Microphone
Yes
Yes
Speakers
Yes
Yes
Vibration motor
Yes
Yes
4. Health & activity Even
Fact
Oppo Watch S2
Oppo Watch S
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes (includes FatMax estimated fat burned in grams)
Yes
Floors
Yes
Yes
Sports tracking
Yes (100+ sports modes; FatMax on 16+ activities; 65+ strength exercises recognised)
Yes (100+ sports 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
Yes
Skin temperature
Yes
Yes
ECG
Yes (China model)
Yes (China model); not listed on current global specification
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
No significant differences in this area.
5. Smart features No clear edge
Fact
Oppo Watch S2
Oppo Watch S
Smartphone compatibility
Android and iOS (China model; Android + Android and Android + iPhone dual-phone combinations supported)
Android 9.0+ and iOS 14.0+
Operating system at launch
ColorOS Watch 17.0.0
ColorOS Watch 7.1
Processor
BES2800BP
BES2800BP
Storage
4 GB eMMC
4 GB eMMC
Bluetooth
Yes
Yes (5.2)
Wi-Fi
No
No
NFC / connected pay
Yes (unencrypted access cards; regional support varies)
Yes (unencrypted access cards; regional support varies)
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)
Xiaobu Assistant (China)
6. Navigation & safety No clear edge
Fact
Oppo Watch S2
Oppo Watch S
Maps
Yes
Yes
Offline maps
No
No
Navigation
Yes (phone-linked navigation information via Fluid Cloud)
Yes
Emergency SOS
No
No
Satellite SOS
No
No
Fall detection
Yes
Yes
LED flashlight
No
No
Diving
No
No