Withings ScanWatch 2, the smartwatch awarded by Les Numériques 2025 readers

Les Numériques readers awarded first prize to Withings' ScanWatch 2, which they consider to be “one of the most effective health tracking systems on the market.” Equipped with numerous sensors and the exclusive TempTech24/7 module, ScanWatch 2 is capable of monitoring your body day and night. What's more, its exceptional battery life of 35 days sets it apart from most of its competitors.

Features

Continuous temperature monitoring

• Day and night reference temperature variations
• Training temperature zones
• Temperature zones upon waking

Cardiovascular health

• ECG - Atrial fibrillation detection
• Daytime heart rate
• Nighttime heart rate
• High and low heart rate notifications
• Irregular rhythm notifications

Sleep parameters

• Sleep quality score
• Sleep stages (deep, light)
• Sleep duration
• Interruptions
• Regularity

Respiratory health information

• Blood oxygen saturation levels on demand & nighttime average
• Respiratory quality index

Activity tracking

• Heart rate zones during training
• Cardio fitness index based on VO2 max estimate
• Active minutes
• Number of steps
• Calories burned
• GPS connection: distance, pace & elevation
• Elevation: altitude in meters & number of floors

Cycle tracking

• Menstrual cycle phases
• Menstrual cycle log
• Menstrual cycle length
• Menstrual cycle symptom log
• Menstrual flow log
• Calories burned
• Menstrual cycle mood & emotion log
• Symptom & flow trends

Specs

Weight & Dimensions

• Dimensions: 38 mm or 42 mm
• Weight (watch face only): 34.6 g (38 mm), 52.6 g (42 mm)

Display

• Grayscale OLED display
• 14504 px, 282 PPI, 0.63"

Materials

• Stainless steel case
• Sapphire crystal
• Stainless steel crown

Sensors

• TempTech24/7 module
• High dynamic range accelerometer
• 16 multi-wavelength PPG channels
• Altimeter

Water resistance

• 5 ATM

Battery life

• Up to 35 days of battery life
• Charging time: 2 hours
• Charging dock (USB-C compatible)

Connectivity

• Bluetooth® Low Energy
• Withings app
• Available on: App Store (iOS), Google Play Store (Android)
• Compatible with Apple Health, Google Health Connect & Google Fit
• Withings App Web dashboard
• iPhone, iPad, or iPod touch with iOS 16 and above, or Android device with OS 9 and above
• Installation requires a smartphone or tablet

Scope of delivery

• ScanWatch 2 38 mm
• FKM (fluoroelastomer) strap with stainless steel buckle
• Charging dock (USB-C compatible)
• USB-C to USB-A cable included
• Setup guide (English, French, German, Italian, Spanish)
• Product guide