The DSI-4 is a complete, research-grade wireless dry electrode EEG system designed for rapid application of 4 dry electrode EEG sensors on the forehead. This unique fully-integrated wireless EEG system is embedded in a comfortable adult-sized, headband designed for use during sleep.

  • Self-donned and ready to record EEG in under 1 minutes
  • Comfortable for wearing continuously over 8 hours
  • Portable design suitable for light ambulation in office or lab environment
  • 4 sensors positioned at the F7, F8, Fp1, Fp2 locations of the 10-20 International System
  • Continuous impedance monitoring
  • Bluetooth wireless transmission with sampling at 300 or 600 Hz
  • 4-bit digital trigger input
  • Adjustable to fit a wide range of head sizes



The DSI-4’s practicality, portability, and high signal quality opens the door to taking numerous applications that require rapid and non-intrusive EEG recording. Such applications include:

  • Neurocience Research
  • Sleep Research
  • Meditation Training
  • Neurofeedback
  • Brain-computer interfaces
  • Neuromarketing
Sensor Locations 4 sensors at 10/20 locations: F7, F8, Fp1, Fp2
Common-Mode-Follower Fz is default reference (can be changed to LE in software)
Ground Fpz
Amplifier/Digitizer 16 bits, 4 channels
Analog/Digital Resolution 0.317 uV referred to input
Analog/Digital Converter 16 bits
Sample 300 Hz (600 Hz option)
Bandwidth 0.003-150 Hz
Gain 60
Common Mode Rejection Ratio > 120 dB
Channel Cross-Talk < -70 dB with sensors
Input Impedance (1Hz) 47 Gohm
Input Bias Current <25 pA
DC Offset Tolerance +/-200 mV
Maximum Input Range 10 mV pk-pk
Noise (1-50Hz) < 1 uV RMS
Digital Inputs 4 bits
Run-time > 12 h
Wireless Bluetooth
Wireless Range 10 m
Headset weight 102 g
Headsize Fit 52-62 cm circumference
Headset Fixed sensors on spring-loaded arms and pods for sensor support
Notice *Specifications subject to change, please contact us to obtain latest specifications