1.Getting Started #

Welcome to V3!

This guide will explain the features of your focus V3 brain stimulator and how to best use it.

1.1.Stimulation Warning - Important! #


You should not use the foc.us stimulator if you suffer from epilepsy, seizures, brain lesions, bipolar depression or severe heart disease. Immediately stop using foc.us i you experience short-term negative effects. Foc.us is not a toy and is not intended to be used by anyone under the age of 18 years old. It is not recommended to place external electrodes in un-tested or novel montages. Do not position electrodes in a manner where current may pass through the brainstem. Do not position electrodes over cuts, grazes or damaged skin. Allow at least 48 hours between each use of foc.us. Always place wet sponges between the electrodes and your skin. Do not touch the black conductive silicone electrodes when using foc.us.



Foc.us is designed to be used by healthy adults who do not suffer from epilepsy, brain conditions, have a metallic implant such as a skull plate or have implants, such as cochlear implant or pace-maker. The sole purpose of foc.us products is for cognitive gain.

1.2.What's in the box #


  • Focus V3 – Advanced Brain Stimulator
  • Amx/y conductive silicone wet sponge electrodes
  • x/y connecting cable
  • Foc.us water bottle
  • 1 paix soft natural sponges
  • Foc.us v3 charging usb cable
  • Focus headband

1.3.Quick Start Guide #

Prepare electrodes

  1. Place the sponges in the amx/y electrodes and then wet with water from the bottle. A pinch of salt can be added to the bottle but is not mandatory.
  2. Position the electrodes on your head using the headband.
  3. Connect the x/y cable to the amx/y electrodes and the v3 stiumulator. By default the X is the anode and the Y is the cathode but this is dependent on the stimulation mode used.
  4. Start a stimulation program by following the instructions on the V3 menu.

1.4.Charging your Focus V3 #

Using the USB to 2.5mm V3 recharging cable, connect one end to a powered USB outlet and the other to the foc.us V3.

2.Focus V3 Stimulation Programs #

2.1.Gamer Stimulation Program #

Focus Gamer is a tDCS stimulation program designed for increased focus and vigilance.

10 minutes @ 1.5mA

Target: dlPFC

Electrode positions: X left forehead, Y right forehead

2.2.Ripple Stimulation Program #

The Ripple Program of V3 uses tRCS stimulation mode to increase peak alpha.


Power: medium

Intensity: moderate

Gradient: moderate

Electrode positions: Left and Right Occipital


2.3.3rd Eye Program #

3rd Eye program is design to stimulate your pineal gland

11mins @ 1.618mA 936Hz bipolar tACS

2.4.Wave Program #

Wave Program uses unipolar tACS as an alternate for those who find tDCS uncomfortable.

18mins @ 1.5mA 1Hz unipolar tACS

2.5.Pulse Program #

Pulse program uses tPCS 

10mins @ 1.5mA 20% dutycycle 40Hz tPCS

3.Focus V3 Features #

Get to know all of the features included in your focus V3 brain stimulator.

3.1.tDCS mode #

V3 includes tDCS stimulation mode.

Placebo: OFF / BLIND / ON

Voltage: 10V, 15V, 20V, 25V, 30V, 35V, 40V, 45V, 50V, 55V, 60V

Current: 0.1mA, 0.125mA, 0.15mA, 0.175mA, 0.2mA, 0.225mA, 0.25mA, 0.3mA, 0.35mA, 0.4mA, 0.45mA, 0.5mA, 0.55mA, 0.6mA, 0.65mA, 0.7mA, 0.75mA, 0.8mA, 0.85mA, 0.9mA, 0.95mA, 1mA, 1.1mA, 1.2mA, 1.3mA, 1.4mA, 1.5mA, 1.6mA, 1.7mA, 1.8mA, 1.9mA, 2.0mA

Duration: 1min, 2min, 3min… 39min, 40min

Polarity Anodal / Cathodal

3.2.tRCS Mode #

3.3.tACS Mode #

Bipolar or unipolar sine wave;
Output current 0.1…2.0 mA;
Output maximum voltage 10…60 V (selectable);
Frequency 0.1…1000 Hz;
Current offset.

3.4.tPCS Mode #

Bipolar or unipolar square pulses;
Output current 0.1…2.0 mA;
Output maximum voltage 10…60 V (selectable);
Frequency 0.1…100 Hz;
Duty cycle 20…80 %;
Current offset.

3.5.tRNS Mode #

Bipolar or unipolar random current;
Output current 0.1…2.0 mA;
Output maximum voltage 10…60 V (selectable);
Random current value or (and) random frequency value;
Frequency 0.1…650 Hz (both min and max values are selectable).

4.Maintenance & Trouble Shooting #

4.1.Specifications #

General Specifications

  • Super fast current regulation;
  • Triple overcurrent protection;
  • Timer 1…40 min
  • Slow current ramping up and down at 0.1 mA/s
  • Selectable electrodes polarity;
  • Overuse reminder (24 or 48 h);
  • Sham mode (or blind sham)
  • Optimal current calibration feature;
  • Accelerometer;
  • Vibration motor;
  • Internal memory for tES and motion tracking logs;
  • N-Back game;
  • Timed start and lucid dream modes;
  • Bluetooth low energy;
  • Upgradable firmware;
  • Internal rechargeable battery;
  • ARM MCU;
  • CE certification;
  • tDCS, tACS, tRCS, tPCS, tRNS Stimulation modes;

4.2.Cleaning & Storing #

Always store your foc.us V3 in the provided case when not in use. Squeeze any excess water from the sponges after use and place them in the electrodes. Ensure the lid of the supplied water bottle is tightly closed before returning to the case.

The silicone electrodes can be disassembled for cleaning if required. Push to re-insert into the metal connectors.

4.3.Troubleshooting Common Problems #

Cannot pair with phone?

Ensure Bluetooth is turned On and Airplane Mode is turned OFF. Both settings can be found in the V3 Setup menu.

Cannot pair with phone previously paired with?

Unpair (forget) in phone and use the “Reset settings” option in the V3 Setup menu to delete previous bonding records and reset to factory values.


4.4.Warranty & Guarantee #

foc.us warrants the foc.us device device (the “Product”), and only the Product, against defects in materials and workmanship under normal use for a period of twelve (12) moths commencing on the date of original purchase by the original purcaser (the Warranty Period). This warranty does not cover damage caused by misuse, abuse, natural and/or external causes (e.g. fire, earthquake, flood etc…), use other than as intended and described in the Product instruction manual, finishes, normal wear and tear,  tampering, unreasonable use, service performed by unauthorized service agents, or loss of damages to the battery. foc.us does not warrant that the operation of the Product will be uninterrupted of error free.

Limitation of remedies

Under this Limited Warranty, foc.us liability and customer’s exclusive remedy under the foregoing paragraph will be limited to replacement or repair of the Product by foc.us or its authorized service centers. A replacement Product or part assumes the remaining warranty of the original Product or ninety (90) days from the date of the replacement or repair, whichever is longer. To obtain warranty service contact help@foc.us. For your security please return your Product with an insured carrier (e.g. FedEx, UPS, USPS Parcel Post) and retain your receipt. foc.us is not responsible for items damaged or lost in transit. Other than for the reason of hardware defects, the return freight cost responsibility belongs solely to the customer.

Limitation of damages

In no event will foc.us or any of its affiliated or subsidiary companies be responsible for any special, incidental, or consequential damages resulting from the use of this Product, or based on any breach of warranty, breach of contract, negligence, tort, or any other legal theory. Such damages may include, without limitation, loss of savings, or revenue, loss of profit, loss of use, the claims of third parties, including without limitation, retailers, any cost of any substitute equipment or services. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. The warranty gives specific legal rights, and you may have other legal rights, which vary from state to state or country to country. This Limited Warranty is valid only in the United States and Europe for Products sold in the United States and Europe. Reseller, agents or employess of foc.us are not authorized to make any modification, extension, or addition to this Limited Warranty.


FCC warning statement: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment End users must follow the specific operation instructions for satisfying RF exposure compliance. This transmitter must not be co-located or operated in conjunction with any other antenna or transmitter. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.


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