How to use - HumanCharger

How to use

User manual can be found here: HumanCharger® manual

Intended use & indications

The HumanCharger® is intended for alleviating symptoms caused by jet lag, and typical symptoms of winter blues caused by lack of sunlight.

Jet lag is a physiological condition which results from alterations to the body’s circadian rhythms resulting from rapid long-distance time zone crossing (east-west or west-east) travel.

Winter blues is also known as subsyndromal seasonal affective disorder (S-SAD). S-SAD is a milder form of seasonal affective disorder (SAD). SAD is a recurrent pattern of depressive symptoms during the fall and winter that remit in the spring and summer. S-SAD tends to affect sleep and energy especially, with some degree of effect on mood each fall-winter but, unlike SAD, S-SAD people do not fulfill criteria for major depression.

Use HumanCharger® if you feel or experience the following symptoms related to winter blues or jet lag:

  • irritability
  • loss of interest in activities you usually find enjoyable
  • feeling of worthlessness or hopelessness
  • oversleeping
  • loss of energy
  • social withdrawal
  • decreased physical activity
  • fatigue
  • cravings for foods that are high in carbohydrates 
  • weight gain


The device is not intended for a person with diagnosed  depression or anxiety, a person with antidepressant medication or a person who has or has had suicidal thoughts or has ever tried to hurt others or themselves.

The device is not intended for children or for use during pregnancy.

The device may not be suitable for individuals who suffer from bipolar disorder.

Side effects          

Side effects of the use of the device are rare when the instructions for appropriate use are followed. The most common side effects that have been reported in our previous studies are a temporary headache, insomnia, and nausea. Additionally, there is the possibility of restlessness, decreased quality of sleep during the early morning hours, dizziness, earache, tinnitus, irregular heartbeat, irritability, sweating, “buzzing of ears”, and sleep disturbances.


Consult your physician and have your current medication reviewed before using the device, if:

  • You have low blood pressure (hypotension)
  • You have an ear infection
  • You suffer from or have suffered from, diagnosed depression
  • You have diagnosed bipolar disorder
  • You are hypersensitive to light (e.g. because of epilepsy)
  • You are using:
    • psychotropic drugs (e.g., antidepressants or neuroleptics)
    • photo-sensitizing medications (e.g., certain antibiotics or herbal compounds such as hypericin or anti-malarial tablets)

Do not use the device while performing tasks that require an unrestricted hearing, to avoid hazards due to restriction in hearing capability caused by the earbuds.

Do not look directly into the light-emitting earbuds, to avoid eye irritation or damage.

Do not use excessive force to insert the earbuds, to avoid damaging your ear canals.

Keep the device and its parts out of the reach of children. The small parts could present a choking hazard.

If the device becomes damaged or degraded in any way or does not work, do not operate it. Contact Valkee for service assistance.

Do not share earbuds to avoid personal hygiene risks.

Do not overuse the device. This helps to avoid nausea, headache and sleep disturbances. Clinical data are available only on the recommended dosing.

Make sure that neither the device nor any of its cables can catch on anything when you are using the device, to eliminate the possibility of strangulation.

The device contains an integrated, rechargeable lithium-ion battery. Do not incinerate, disassemble, or expose to extreme temperatures, because the battery could overheat, causing a fire or bursting.

No modification of this device is allowed. Contact Valkee for service assistance.