Embedded System Components
Processor: Nordic nRF52832
Memory: 28 KB RAM
Internal Flash: 128 KB
External Flash: 1024 KB

Sensors
​3-Axis Accelerometer: ADXL362

Code Space
Total Firmware Space: 137 KB

Battery
​Li-ion rechargeable
Capacity: 100 mAh
Battery Life per Charge: 30 days Average2

Charging
Standard USB 2.0 port

Physical Specifications
​Overmold material: Cycoloy FR Resin (C6600)
Strap thickness: 2.6 mm (0.1 in)
Strap width: 16.5 mm (0.65 in)
Pod width: 21 mm (0.83 in)
Pod height: 13 mm (0.51 in)
Weight: 24 g (0.85 oz)

Data Interface
Bluetooth 4

Power Consumption
1µA RTC

Dust resistance
IP68 rating

Water resistance
​Refer to http://help.fatiguescience.com/managing-readibands/about-the-readiband/what-is-the-readiband for details.
​
​Operating Environment
​Between 0C to +55C (+32F to +131F), 0-95% relative humidity (non-condensing), and 700 to 1060 hPa (pressure). Up to 3000m altitude.
​

It is acceptable for the altitude to be exceeded on a pressurized plane.

Storage Environment
​Between -40C to +75C (-40F to +167F), 0-95% relative humidity (non-condensing), and 700 to 1060 hPa (pressure). Up to 3000m altitude.

It is acceptable for the altitude to be exceeded on a pressurized plane.

Shipping Environment
​Between -40C to +60C (-40F to +140F), 10-100% relative humidity (non-condensing), and 190 to 1060 hPa (pressure). Up to 12800m altitude.

Charging Environment
​Between 0C to +40C (+32F to +104F), 0-95% relative humidity (non-condensing), and 700 to 1060 hPa (pressure). Up to 3000m altitude.