Fitbit Versa 4 Smartwatch

Sensors & Components
Multi-path optical heart rate sensor
Red and infrared sensors for oxygen saturation (SpO2) monitoring
Altimeter
3-axis accelerometer
Ambient light sensor
NFC
Built-in GPS + GLONASS
Vibration motor
Speaker (75dB SPL @10cm)
Microphone
Water resistant to 50m.

Battery & Power
Battery life of 6+ days. Battery life and charge cycles vary with use, settings and other factors; actual results will vary. We recommend charging your tracker every few days to ensure you are always tracking.