Do you have a question? look for answers to common questions below.

Is CALM. available in my country?

CALM. will initially be available in Japan, US and Canada. Availability in other countries will follow once we clear certification.

What is CALM.'s warranty?

CALM.’s warranty is 1 year, and does not cover consumables and accessories. Details are available here

Is CALM. a medical device?

CALM. is not a medical device, and should not be used to diagnose or treat medical conditions.

What does CALM. track?

3 axis Acceleration
Heart rate and heart rate zones
Resting heart rate when worn while sleeping*
Irregular heart rhythms
Respiration rate*
Sleep stages and quality*
Autonomic nervous state (CALMness Score)

I got my CALM. How do I get started?

Check out our getting started guide here: Guide to using CALM.

What does the Electrocardiogram (ECG) wave tell me?

The primary information from CALM. is your ECG wave, which is the electrical signal from your heart beat. The CALM. App uses this signal to calculate your heart rate, detect possible irregularities, and other statistics, but to really understand the ECG, you may want to get to know the science better. Here are some good sources of information.


The Basics of ECG by Interactive Biology

More about irregularities from tootRN

Online Courses:

A very comprehensive course about using ECG for athletes from BMJ Learning:

How do I turn CALM. on and off?

CALM. does not have a on/off switch, and simply goes to sleep if not used for a while. You can double tap CALM to wake it up from sleep.

What is the range of CALM.?

CALM. uses Bluetooth LE to sync. Under real world conditions, It will work up to 3 meters, but will depend on your smartphone, and other interference in the environment.

Is CALM. waterproof?

CALM. is rated IPX3. It is water resistant against splash and sweat. It is not designed for swimming or diving; submersion in water can cause damage.

The signal quality is bad/noisy. How can I improve it?

Make sure the gel pad or the chest belt is firmly attached to your body. Clean your skin and make sure it is free of dirt and oil before application. If you have dry or hairy skin, conductive wet gel such as these might help improve signal quality.

How long does CALM. work on a single charge?

CALM. will work continuously for up to 72 hours.

Does the CALM. App support my smartphone?

The CALM. App supports the following Operating systems:
Android 4.4 and up

iOS 10 and up

We have tested the CALM. App with the following phones:

  • Apple iPhone 5c
  • Apple iPhone 6
  • Apple iPhone 7
  • Huawei P9
  • Motorola G4
  • Xiaomi Redmi 3
What languages are supported in the CALM. App?

The CALM. App will support English and Japanese*.

Can I connect CALM. App to other fitness apps?

We currently do not have the feature to share data across other apps.

What kind of accessories are available?

We have custom designed foam electrodes, and chest belts. We are working on more accessories for the future.

Can I use CALM. for commercial applications?

It is possible; however due to limited manpower, we cannot support all commercial developments for CALM. Please contact us for details.

*Coming soon via software update