ActiGraph wGT3X-BT

The wGT3X-BT is ActiGraph’s flagship activity monitor, used by researchers around the world to capture and record continuous, high resolution physical activity and sleep/wake information. The Bluetooth® Smart wGT3X-BT features ActiGraph’s validated 3-axis accelerometer and digital filtering technology and includes integrated wear time and ambient light sensors.

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Declaration of Conformity / Declaration of Conformity (Brazil)
Cross Generation Accuracy / Calibration
U.S. federal law restricts this device to sale by or on the order of a physician.

ActiGraph Digital Measures

The ActiGraph wGT3X-BT captures and records high resolution raw acceleration data, which is converted into a variety of objective activity and sleep measures using publicly available algorithms developed and validated by members of the academic research community. Available measures include:

  • Raw Acceleration (G's)
  • Activity Intensity
  • MVPA
  • Steps
  • Calories
  • MET Rates
  • Locomotion
  • Total Movement
  • Total Sleep Time (TST)
  • Sleep Efficiency
  • Wake After Sleep Onset (WASO)
  • Sleep Fragmentation
*Requires compatible Bluetooth® Polar H7 or Polar H10 heart rate monitors

ActiGraph wGT3X-BT Features

Bluetooth® Smart

ActiGraph wGT3X-BT monitors are powered by Bluetooth® Smart technology and support a variety of wireless features, including heart rate monitoring, proximity detection, and communication with ActiGraph’s suite of mobile applications for iOs and Android devices.

Wear Time Sensor

A wear time sensor on the back of the monitor uses capacitive touch technology to automatically detect when a wrist worn device has been removed for simplified compliance monitoring and data cleaning.

Ambient Light Sensor

The wGT3X-BT includes an integrated ambient light sensor that delivers lux values alongside activity information, providing insights into the relationship between the subject environment and activity and sleep behaviors.

ActiGraph wGT3X-BT Specifications

The ActiGraph wGT3X-BT captures and records high resolution human activity information using a solid state 3-axis MEMS accelerometer and our proprietary filtering algorithm. The wGT3X-BT is fully backward compatible with previous device models to ensure data comparability for our existing clients.


4.6cm x 3.3cm x 1.5cm


19 grams

Sample rate

30-100 Hertz

Dynamic range

+/- 8G

Battery life

25 days*



Data storage

180 days


USB, Bluetooth® Smart

Wear location

Wrist, waist, ankle, thigh

Water resistance

1 meter, 30 minutes


1 Year

*Wireless disabled, 30 Hz sample rate

Regulatory Requirements

The ActiGraph wGT3X-BT is an FDA cleared Class II medical device within the United States and a Class I medical device within the European Union that abides by the regulatory requirements listed below:

  • EN60601-1-Medical Device General Safety Requirements
  • Part 15.109 (US) – Radiated Emission Limits of Unintentional Radiators
  • Part 15.249 (US) – Radiated Emission Limits of Intentional Radiators
  • ICES-003 (Canada) – Interference Causing Equipment Standards for a Digital Apparatus.
  • ActiGraph is compliant with IEC standards for “Type BF Applied Part”

The ActiGraph wGT3X-BT is water resistant in accordance with IEC 60529 IP27, or immersion in one (1) meter of water for up to 30 minutes.

All ActiGraph products are manufactured Lead Free and are RoHS Compliant.

U.S. federal law restricts this device to sale by or on the order of a physician.

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