What's Inside the Watch

Group (2)

Bluetooth Smart Enabled


Rugged and Durable Design

display icon

25-Days Battery Life

ActiGraph wGT3X-BT


The wGT3X-BT is ActiGraph’s legacy/original wearable device for continuous, real-world monitoring of activity, mobility and sleep:

  • Versatile Wear Locations: wGT3X-BT offers maximum wear position flexibility with options for wrist, waist, ankle and lumbar worn devices.
  • Ambient Light Sensor: Integrated light sensor that delivers lux values alongside motion data, providing insights into the relationship between the participant environment and activity and sleep behaviors.
  • Wear Time Sensor: Wear time sensor on the back of the device uses capacitive touch technology to automatically detect when a wrist worn device has been removed.

Declaration of Conformity

ActiGraph wGT3X-BT is compatible with

Woven Nylon Wristband

Woven Nylon Wristband

wGT3X-BT Belt Pouch

wGT3X-BT Belt Pouch

USB Cable

USB Cable

Elastic Belt

Elastic Belt

ActiGraph wGT3X-BT Specifications

The ActiGraph wGT3X-BT is optimized for everyday activity & sleep monitoring


  • Battery Life: 25 Days
  • Data Storage: 180 Days / 4GB
  • Sample Rate: 30-100 Hertz
  • Dynamic Range: +/- 8G
  • Dimensions: 4.6 x 3.3 x 1.5 cm
  • Wear Location: Wrist, Waist, Ankle, Thigh
  • Weight: 19 grams
  • Communication: USB, Bluetooth® LE
  • Water Resistance: IPX7 (1 meter, 30 minutes)
  • Warranty: 1 year


Physical Activity
  • Total Movement
  • Moderate to vigorous physical activity (MVPA)
  • Non-sedentary time
  • Step count
  • Energy Expenditure
  • Total sleep time (TST)
  • Sleep efficiency (SE)
  • Wake after sleep onset (WASO)
  • Sleep onset latency (SOL)
  • Sleep fragmentation index


Pioneering the Digital Transformation of Clinical Research