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Bitbrain Versatile 16-channel EEG

The Bitbrain Versatile is a 16-channel mobile and portable semi-dry EEG system designed for real-world recordings. It uses water-based electrodes and supports flexible sensor placement with the 10–20 and 10–10 international systems.

For full instructions, consult the official guide:
Diadem 12ch EEG User Guide (EN, v.2025)

Bitbrain Versatile 16 EEG

Image © Bitbrain Technologies S.L. Used for documentation and identification purposes.

Overview

Versatile 16ch EEG is a semi-dry, water-based EEG device intended for research use. Sensors are moistened with tap water and mounted on a fabric cap, enabling recordings outside controlled laboratory settings. Data can be streamed wirelessly via Bluetooth and stored locally on a microSD card at the same time.

The system is not a medical device and is designed exclusively for research purposes.

Video Guide: Placement and Setup

EEG Channels and Layout

The system supports:

  • 16 EEG channels
  • Ground (GND)
  • Reference (REF, ear clip)

Electrodes can be placed freely at labeled positions on the cap according to the international 10–20 and 10–10 systems. Sensor positions must be recorded and kept consistent for analysis.

Technical Specifications

  • Sampling rate: 256 SPS, 24-bit
  • Battery life: > 8 hours
  • Charging time: < 3 hours
  • Data transmission: Bluetooth 2.1 + EDR (≈ 10 m line-of-sight)
  • Local storage: Removable microSD card, up to 8 GB, Class ≥ 10
  • Data format: .sdf (conversion via software)
  • Nominal voltage: 3.7 V
  • Nominal power: 555 mW
  • Amplifier dimensions: 78 × 72 × 32 mm
  • Amplifier weight: 125 g
  • Charging connection: Barrel plug (charger provided)
  • Certification: CE (Directive 2014/53/EU)

System Components

The standard kit includes:

  • 16-channel amplifier with internal battery
  • EEG cap with chinstrap (10–10 system)
  • Set of EEG electrodes and connectors (16 EEG + GND + REF)
  • Sensor holder for storage
  • Sensor sockets
  • Wet sensors (sponges)
  • Cable fastening band
  • Measuring band (head perimeter)
  • 8 GB Class-10 microSD card with SD adapter
  • Battery charger with adapters

Optional accessories (via auxiliary input):

  • Photodiode EEG
  • Button box (1-bit trigger)
  • Pedal (1-bit trigger)
  • TTL trigger (Bitbrain or external)
  • Pulse generator (system synchronization)
  • Duplexer (photodiode + trigger)
  • HTC Vive Pro attachment kit

Setup Summary

1. Preparing the Cap and Sensors

  1. Measure the participant’s head perimeter and select the correct cap size.
  2. Insert sensor sockets into the desired labeled positions on the cap.
  3. Insert EEG sensors firmly into the sockets, routing cables toward the back.
  4. Prepare sponges by soaking them fully in tap water.
  5. Roll each sponge and insert it into the inner holder of each sensor.
  6. Do not wet the EEG connector.

2. Power and Connectivity

  • Turn on the amplifier using the power button.
  • The Bluetooth LED flashes while connecting and stays on once paired.
  • Low battery is indicated by the battery LED.
  • Do not use the device while charging.

3. Recording and Storage

  • Pair the device via Bluetooth (version 2.1 or higher).
  • The Bluetooth name corresponds to the amplifier serial number.
  • Data can be streamed to the computer and recorded to the microSD card simultaneously by enabling SD card recording in the software.

Placement Summary

  1. Measure the nasion–inion distance and locate Cz at the midpoint.
  2. Place the cap from the forehead backward, ensuring Cz is correctly positioned.
  3. Center the cap so lateral sensors are symmetrical.
  4. Attach and adjust the chinstrap.
  5. Organize cables toward the back of the head and secure them using the fastening band.
  6. Connect the EEG connector to the amplifier with the side labeled “This Side Up” facing upward until a double click is heard.
  7. Attach the amplifier to the Velcro patch at the back of the cap.
  8. Prepare and attach the reference clip with a damp sponge to the earlobe.

Recording and Signal Quality

  • EEG signals are displayed in real time in the acquisition software.
  • Sensor color indicates relative contact impedance.
  • If signal quality is poor:
  • Gently press the sensor against the scalp using small circular motions.
  • Check sponge humidity and re-dampen if necessary.
  • Wait a few seconds after each adjustment for stabilization.

Battery and Power Handling

  • Disconnect the charger once the battery is fully charged.
  • Do not store the device for long periods with the battery at 100% charge.
  • Store the system in a dry environment between 5 °C and 40 °C.
  • Use only the charger provided by Bitbrain (maximum 1 A).

Cleaning and Maintenance

  • Remove electrodes and sponges before cleaning the cap.
  • Discard sponges after each use for hygiene reasons.
  • Clean the cap after each session using slightly warm water and mild detergent.
  • Disinfect the cap using a validated disinfecting solution as specified in the user guide.
  • Do not use abrasive or strong disinfectants.
  • Store caps and electrodes in a dry place when not in use.

More Information

Full technical details, safety information, and diagrams are available in the official user guide:
Diadem 12ch EEG User Guide (EN, v.2025)

Manufacturer: Bitbrain Technologies S.L., Zaragoza, Spain

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