Go Flow 4 tDCS Brain Stimulator


In stock

(20 customer reviews)

Foc.us Go Flow 4 – the Most Powerful, tDCS Available Anywhere.
NEW: Includes 0.75Hz sotDCS mode – slow oscillating transcranial Direct Current Stimulation.
Now shipping!

4mA max-tDCS and 0.75Hz so-tDCS modes.

<35 minute timer, comfort ramping, realtime current display

Everything you need – stimulator, battery, electrodes, sponges, magnetic cable, travel case, instructions.

The smallest tDCS stimulator in the world is also the most powerful with upto 4mA of double-isolated tDCS goodness.

Now also includes slow oscillating tDCS mode as BONUS feature.

Go Flow 4 tDCS Brain Stimulator


In stock

Go Flow 4 includes:

  • Go Flow Stimulator
  • 9v Battery
  • Headband
  • 4 x Amxy Electrodes
  • 4 x Electrode Sponges
  • Magentic x/y cable
  • Dual x/y magnetic cable
  • Travel Case
  • Instruction booklet
  • Saline bottle

What's Included

  • Go Flow 4
  • Foc.us Headband
  • Foc.us 9V battery
  • x/y magnetic cables
  • 4 x amx-y silicone electrodes
  • 4 x sponges
  • Water bottle
  • Carry case (red)

Stimulation Modes

  • tDCS
  • sotDCS 0.75Hz 


  • 7 LED accu-gauge
  • Green = duration
  • Red/Amber = current

Battery and Power

  • We recommend leaving Go Flow 4 connected to battery

    Battery life up to 8,000 sessions.

    • Battery type: Ultra alkaline
    • Non-rechargable


  • Current: 1.0, 1.5, 2.0, 3.0, 3.5, 4.0mA (±0.25mA during session)
  • 5, 10, 15, 20, 25, 30, 35 minute duration timer


Store all Go Flow components in the case when not in use. Sponges should be squeezed dry and will reshape when next wet.

Materials Used

The Foc.us headband is made of a soft, synthetic poyester. The amx-y electrodes are made from skin-safe FDA approved silicone. 

The carry case is made from animal friendly fake leather.

Environmental Requirements

  • Operating temperature: 0° to 70° C
  • Maximum operating altitude: 50,000ft


Go Flow 4 has 4mA – double the power of other tDCS stimulators. With great power comes great responsibility. You must monitor yourself during DIY-tDCS and end the session or reduce the current if any adverse short-term negative effects.

take chargetm

The most powerful tDCS stimulator is also the smallest. Take charge anywhere, anytime.

Digital Operation

1. Press to turn on 2. Press to set current 3. Press to start session.

No App Required

Go Flow i

4mA tDCS

Controlled tDCS sessions from 1.0mA to 4mA in 0.25mA increments.

0.75Hz sotDCS

slow-oscillating transcranial Direct Current Stimulation at 0.75Hz in sotDCS mode.

Sleep Spindles

sotDCS has been shown to increase the power and duration of slow-wave spindles during sleep.

Sports Montages

Supports all known sports stimulation montages and ships with 4 electrodes for multi-focal capabilities.


The most accurate current control circuitry on the planet. Dual current over-lock safety systems. The cleanest tDCS signal possible.

Comfort Control

Change the current up or down during an active session. Automatic ramping on session start and stop.

Compare foc.us Brain Stimulators

Max current mA

4.0 mA

2.1 mA

Maximum voltage


Configurable 15V to 65V

Stimulation Modes




27mm x 27mm x 12mm

60mm x 28mm x 9mm


9V Dry Alkaline PPV9

Internal rechargable LiPo 3.7V



Bluetooth Low Energy





3 way rocker switch
UP increase
DOWN decrease
PRESS confirm

5 way joystick
On-screen navigation UI

App control iOS & Android

Included Programs


Gamer, 3rd Eye, Sports, eDream,



Firmware version

Hardware Version

20 reviews for Go Flow 4 tDCS Brain Stimulator

    July 1, 2018


    Very simple to use - click, click done.
    0 0
    December 20, 2017

    love it

    Quickly reduces my anxiety almost every time I use it. Love it.
    0 0
    December 18, 2017

    Very basic

    The Go Flow connected to the 9V battery is very easy to use.
    It remembers your last settings so if no changes its quicker to start the next session.
    Instructions could be better.
    0 0
    August 19, 2016

    Disappointed too

    I think the product is probably wonderful and will do everything they say it will. BUT there is not one darned piece of instruction with it.

    The headband has ten slots for electrodes but no information on which ones to use or why you would choose one spot over another. Nothing.

    Seven settings for power but no information on choosing a setting. What does it affect.

    Same thing for timing. No information.

    There are some sponge electrodes and also some sticky electrodes in the package. No instruction or information on which to use where or when.

    Not even a tiny piece of paper with a "Go to www.xxxxxxx.com for instructions".

    More like "Here it is. You figure it out."

    0 0
    July 8, 2016

    Don't know?

    The people writing the reviews do not seem to be any smarter?

    I am definitely not any smarter after visiting the website therefore I'm not going to be ordering the product.
    0 0
    March 16, 2016

    No idea

    Theres little to no information included with the product. I've used it a few times now and the electrodes started looking dark brown and stopped sticking completely so i tossed them. That was probably 6 to 8 sessions. Also, the placement of the electrodes is, um, ok, I guess. left forehead, right shoulder, to speed up learning, but I've noticed no enhancement. No real sign that its working other than the stinging at the start but it goes away. so was it stinging b/c that is the only time the current was moving or what? I'm going to continue using it and will see if anything changes but as of right now, I feel this is a novelty.
    0 0
    March 11, 2016

    Again, Exceeds Expectation

    only took a few minutes to get used to. Ingenious simplicity, yet powerful. It is so astonishingly good that i am almost speechless.
    0 0
    March 3, 2016

    Great idea!

    The Go Flow is an excellent re-implementation of tDCS in a simple, affordable package that could probably boast to be the smallest device of its kind on the market. Geared towards exclusive users of tDCS, this covers the gamut of anticipated usage from 0.5mA to 2.0mA and from 5 to 35 minutes. Highly recommended for the person just starting to see what all the buzz is about.

    Congratulations to foc.us for having the vision to create this minimalist tDCS product.
    0 0
    March 3, 2016

    Got mine today!

    Trying it out now as I write. Arrived early, nicely packaged and looks to be good quality. Wish they had spent more than 1 minute on the directions though. It says to Connect battery (check-easy, its a tight fit though), Change current indicated (check-trial and error showed me its a rocker panel, orange lights went up and down on the dual indicator) Press to set (check-seemed like it took the setting ) Set duration (check-dual indicator goes from 5-35 minutes) Press to start. Here's where the problem begins. Pressing rocker panel turns lights off, then cycles orange and green lights through range-now you're left with just the orange (current) lights on. Is it on? Is it off? Is it waiting for instructions? Is it working? Shouldn't the timer lights be on, counting down? Whats going on Focus-you're leaving us hanging?
    0 0
    February 12, 2016

    No problems so far

    I've used my foc.us v1 for a few years to treat depression, and my go flow does the same job in a more convenient package at a much lower price.
    0 0
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