> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/flex-2.0-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/flex-2.0-user-manual/introduction/technical-specifications.md).

# Technical Specifications

| Number of Channels             | 32 (plus CMS/DRL references)                                                                                                                                                                                                                    |
| ------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Channel names                  | Configurable on standard 72 channel international 10-20 locations                                                                                                                                                                               |
| Sampling Method                | Sequential sampling. Dual ADCs                                                                                                                                                                                                                  |
| Sampling Rate                  | Configurable 128 / 256 SPS (2048 Hz internal)                                                                                                                                                                                                   |
| EEG Resolution                 | 16 bits 1 LSB = 0.51μV (16 bit ADC, 2 bits instrumental noise floor is discarded)                                                                                                                                                               |
| Bandwidth                      | 0.2 - 45Hz, digital notch filters at 50Hz and 60Hz                                                                                                                                                                                              |
| Filtering                      | Built-in digital 5th order Sinc filter                                                                                                                                                                                                          |
| Dynamic Range (input referred) | 8400uV (pk-pk)                                                                                                                                                                                                                                  |
| Coupling Mode                  | AC coupled                                                                                                                                                                                                                                      |
| Connectivity                   | BLE5 (Dongle Provided)                                                                                                                                                                                                                          |
| Battery Capacity               | LiPo battery 595mAh                                                                                                                                                                                                                             |
| Battery Life                   | Up to 6 hours                                                                                                                                                                                                                                   |
| Impedance Measurement          | Real-time contact quality using a patented system                                                                                                                                                                                               |
| IMU Part                       | <p>TDK ICM-20948 3-axis Accelerometer, 3-axis Gyroscope, 3-axis Magnetometer. </p><p>Data output 10 channels Quaternions, (Q0, Q1, Q2, Q3), Acceleration (X,Y,Z) and Magnetometer (X,Y,Z)</p>                                                   |
| Motion Sampling                | Configurable 0, 32, 64 Hz                                                                                                                                                                                                                       |
| Motion Resolution              | 16-bit output                                                                                                                                                                                                                                   |
| Sensor Material                | <p>Sintered Ag/AgCl ( FLEX gel kit) can be used with any EEG gel </p><p>Electroplated Ag/AgCl ( FLEX saline kit) with replaceable polyester felt pads that can be sterilized and re-used (bulk pack available to buy from the EMOTIV store)</p> |


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