Go Flow 4mA tDCS Brain Stimulator


(21 customer reviews)

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

Just Connect 9v Battery (not included)

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

<35 minute timer, comfort ramping, realtime current display

Everything except 9V battery – stimulator, 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 includes:

What's Included

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

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 synthetic materials and a metal zip.

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,

Weight 0.2 kg
Dimensions 20 × 15 × 5 mm


Firmware version

Hardware Version

21 reviews for Go Flow 4mA tDCS Brain Stimulator

  1. Mat

    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.

  2. Matty2tan

    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?

  3. galvin

    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.

  4. nt

    Feel nothing!

    First report: I plugged in this morning and hooked it up as instructed (X is on the left forehead and Y is on the right shoulder blade) then I set for 35′. By some reasons I didn’t feel anything. I then reset it to run for 5′ and I still don’t feel anything. I might have expected the tingling more than it should have been … I don’t know. I will submit my “Second” report after this 5′.

  5. ntt

    Second Report

    Oops, I started to feel tingling

  6. Rustin

    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.

  7. Chris

    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.

  8. WIO

    Got Burned.

    This seemed like a great idea with an even better price. The first time I tried the “learn faster” configuration at 1.5 mA for 15 min. I felt a little “pinching”at the shoulder pad and when I was finished there was a mark there. I checked the connections to make sure I had things set correctly (I did) and figured that it may have been due to my rather haphazard pad placement.

    The next time I tried it I was more careful. I shave the area on my shoulder, wiped the skin with a little soap and water and once that had dried I carefully placed the pads, again in the “learn faster” configuration. This time I turned it down to 1.0 mA for 15 minutes. Again I felt a sharp, burning, pinching sensation at the shoulder pad location. This did diminish over the course of 5 minutes or so. When I was done There was a reddish-white lesion a little bigger than a pencil eraser under when I removed the shoulder pad.

    This didn’t hurt much so I didn’t think much of it. A couple of days later I accidentally poked it and felt nothing which was concerning. I went into have it examined and was basically told that I had a small full-thickness or 3rd degree burn. The dead skin layer was cut away to allow healing and is doing well but is going to leave a scar.

    I definitely wanted to play with the Go Flow but for now I think I’m done. I don’t think this will happen to everyone who uses this product. I may have a defective unit or my body chemistry might be off but I would say that if you feel like you are getting burned you probably are and stop your session.

  9. The real deal

    Ok but too small.

    I believe the unit is too small. It definatley works but at 99 dollars I would think they would give alot extras. I will keep on using it..

  10. Smarter?

    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.

  11. Noobie

    Where are the directions?

    Hey I don’t want a LOT of instruction but telling me what X and Y mean would be fantastic.

  12. Dan

    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 http://www.xxxxxxx.com for instructions”.

    More like “Here it is. You figure it out.”

  13. jithor

    Go Floe

    My Go flow to reach me worked perfect.
    Thank you very much

  14. Adrián

    Is this working

    Lest see.. Is this product working? I see a lot or People saying: there isnt any instructions.. Thats the problem, iam spanish guy and it is hard to understand all so if this product havent got any instructions then is a shit.. I want something to improve my depression

  15. Jesse

    Not fake review

    I bought this device not from here but from CAPUTRON site because reading their reviews from their page were best from this page, so better communication with the staff.

    About the product: Same as the picture they show BUT without any colors, the numbers are imprinted in the same plastic device. Other thing is that they did not send me the sticky electrodes patches which i really don’t mind because i prefer to use the sponges with the headband.

    The product came with no instructions but i did not mind because i made my research before ordering and i knew about that issue and searched for online instructions. So if you are new in this therapy i suggest to make a research previously which you definitely should, this is not a toy.

    The device works perfect and it is easy to use, just to clicks on the only button it has and your done. instructions are on this page nothing out of this world.

    I have depression and anxiety, i have used this device 7 days (20 minutes a day) on the most researched electrode positions which is X – Anode in left F3 Region and Y-Cathode in right Fp2 and i REALLY felt and still felling that something is going on for a better, as im doing the tDCS session i’m doing at the same time cognitive games from this page (Unobrain) i’ve read that stimulating your brain while using tDCS is way better.

    Final thoughts: Very happy with this little tDCS device, works perfectly and seems to be working on me. Recommended.

  16. LeeC

    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.

  17. Enki

    love it

    Quickly reduces my anxiety almost every time I use it. Love it.

  18. ZEKA


    for 150 euros you would think some intructions would be included, but no….

    • Mike

      Instructioned are indeed included and can be downloaded from the instructions page.

  19. Sal


    Very simple to use – click, click done.

  20. salah


    very good

  21. cbadbrody (verified owner)

    Great product, super easy to use once you understand it. Also YouTube has some good videos on using this if the instruction manual gets a bit confusing.

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