In this video I review and test the Withings Scanwatch. Subscribe to my weekly Newsletter(!) on www.robterhorst.com
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Withings Scanwatch: https://geni.us/Ixsd8

I will address a couple of things:
A quick unboxing and setup of the device
An overview of its capabilities, and some limitations
A test of the accuracy of the heart rate measurements
A quick look at the quality of the sleep prediction

Accuracy of the FitBit Charge series:
   • FitBit Charge 4 Ultimate Sleep Test  
   • FitBit sleep prediction: scientific t...  
Or the accuracy of the Oura ring for sleep prediction:
   • Oura Ring Scientific Sleep Test (Review)  

⏱This comparison is part of a larger project where I spend over 11 hours a week tracking everything in my life. If you'd like to know more:
   • This mad scientist scanned his brain ...  
.⏱

Timestamps:
00:00 Intro
00:23 Overview
01:05 Watch Models
01:33 Unboxing
02:24 Installation
03:31 Features
03:45 Heart Rate Test Explanation
04:14 Heart Rate Test Results
06:02 ECG
06:37 Oxygen Saturation
07:30 Breathing Disturbances
07:52 Limitations
08:29 Sleep Tracking
09:23 Conclusions

The “Insider program” only had a total of 1000 scanwatches for sale, and they were sold out in minutes. I picked up the 38mm black version. Surprisingly, when I bought it, the price was set to 249,95 euros, however, they quickly changed it to 279.95 even before it was sold out, which is not also the official price listed on the website. The larger version comes in at 299.95.

So what are the features of the scanwatch? It can do a lot: track activity, sleep, heart rate monitoring, monitor oxygen saturation levels, detect breathing disturbances and has 3 electrodes to provide an ECG.

Let’s first have a look at HR. This is one of the most common features in fitness trackers, and of course we want it to be accurate. So for two nights and also during two training exercises I wore both this Polar H10 and the Scanwatch to compare HR measurements in different conditions. Here you can see the results:
[results]
So, the HR accuracy is pretty OK, I’ll do a larger test in a future video.

The ECG measurement checks to see if the upper and lower chambers of your heart are in rhythm. If it detects they're out of rhythm, this is an indicator of the heart condition atrial fibrillation or AFib. For the ECG the first point of contact is on the bottom of the watch, touching your wrist, and for the second contact you have to touch one finger on the rim metal of the watch with your other hand. Which I think is similar to a 1lead ECG, with your right arm as the negative pole and the left one as the positive. Which is also why you have to tell the app on which wrist you wear the device.

It also measures your oxygen saturation, which is basically the amount of oxygen in your blood.

The Scanwatch is able to detect the presence of breathing disturbances using the motion sensor, the SpO2 sensor and the heart rate sensor. With the Respiratory Scan feature, the scanwatch has to measure oxygen saturation levels all night long, to identify when levels are inadequate because of breathing disturbances such as sleep apnea.

Finally, there is the sleep stage tracking. As you might have seen in my other videos, I have tested several wearables against professional sleep devices, and I plan to do this with the Scanwatch as well. However, looking at the data from 2 nights, i can already say some things: (1) the Scanwatch can only predict light sleep, deep sleep and awake, and not REM, which is arguably one of the most important to track sleep cycles, and (2) the scanwatch predicts way to much deep sleep for me, so I doubt the results will be super accurate. However, more to follow in the future!

Overall. I think the Scanwatch holds a lot of promise: it looks great for a Fitness tracker, and has a lot of sensors. However, if you’re not that interested in measuring things like ECG or oxygen saturation, then Withings has cheaper options in their product lineup that arguably look even better.

Acknowledgements
Many thanks to Sebastian Idesis, Frederik Weber and Martin Dresler from the Donders Centre for Cognitive Neuroimaging for all their help with my EEG measurements

Music
(1) Not Without the Rest by Twin Musicom is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Artist: http://www.twinmusicom.org/
(2) Wonders by JVNA
(3) Can’t Sleep (YouTube Audio Library)
(4) Classique (YouTube Audio Library)