hi everyone welcome to wesknows tech news and reviews! on this channel we mostly review and test
fitness wearables in order to test continuous sp02 on smartwatches we need a particularly accurate
and medically certified device and we have that in front of us today the wellue o2 ring wearable
sleep monitor the auto ring takes a heart rate and spo2 reading every one second if you are new to
wesknows tech news and reviews we talk about the latest tech news we do brutally honest reviews and
share hacks and tricks along the way in essence the o2 ring is a medical grade continuous ring
oxygen monitor the ring in the name does suggest that you place it on your finger but not only does
it show you the spot and continuous pulse rate and spo2 metrics on the oled touchscreen it also
alerts you via vibrations that are adjustable in strength if it records low oxygen level
or abnormal heart rate in addition there is a free ios and android app that records and
plots your latest results onto spo2 and heart rate charts you can analyze your trends export the data
and so forth there is a lot to show and tell about this minimalistic device hence without further ado
let's get into it we'll start off with unboxing the ring we'll cover the design and ergonomics of
the o2 ring and then we'll get into the features and functions we'll also show you how to use
the ring how to get the maximum benefit from the app and how to export data to other devices even
your pc the packaging is neat and quite simple slide off the outer sleeve and a white unmarked
box is revealed open the lid by tugging on the black string you are met with a warranty card
fold out user guide and manual on the side there is a micro usb cable for charging the ring
and here is the actual ring let's pull it out considering the size you really don't expect
it to weigh just 15 grams let's charge the ring by connecting the usb charger charging till full
usually takes two to three hours a full battery will usually last you 12 to 16 hours i can squeeze
in two nights of sleep before recharging once the ring is charged and you put it on it switches on
automatically there's a light vibration and the oled screen lights up with two values being shown
your pulse rate or in essence the heart rate and the spo2 or oxygen saturation in your blood
the ring is a one size fits all dimensions are 1.5 inch by 1.2 inch the outer oled touchscreen
is black and slick you get to see key health stats and the battery charge left the inner ring is made
of soft silicon that wraps around your finger for a relatively tight fit to keep the device
in place and stop it spinning around the ring circumference is rubberized and stretches from
50 to 82 millimeters if we look inside the ring we will see the lead emitter and the photodiode
on the other side what these two points indicate is that the o2 ring implements transmissive pulse
oximetry technology let's discuss how the pulse oximeter works and what it actually measures
an oximeter uses leds emitting both red and infrared light a photodetector is positioned
on the other side of the finger opposite the leads and detects the amount of light
whether it is red or infrared light passing through the measurement site the amount of
light absorbed depends on how much oxygen the hemoglobin in your blood is carrying let's pretend
these red shapes are hemoglobin and as we all know hemoglobin is a package of red blood cells
and it has a key function of transporting oxygen to the body tissues the test relies on the fact
that oxygenated and deoxygenated homoglobin absorb different wavelengths of light
the oximeter then displays your spo2 level the values range from 35 to 99 percent
generally a value over 93 percent is satisfactory now that we know how and what the o2 ring measures
let's get into the features and functions offered by the o2 ring as mentioned earlier it is a plug
and play device as long as the device has some charge you can use it straight away
by watching the oled display you can simply see the spot readings but by installing the vihealth
app from the apple store or google play store you get to see continuous readings that were
plotted in trends the plots can be zoomed into and most importantly exported either as images
or in detail csv tabular form where every spo2 and heart rate reading is recorded every four seconds
now the key takeaway here is that even if the app exports data with a four second interval while
the actual measured interval is once per second so within the hour you will have 3600 readings
you can hardly get more granularity than that the oxygen level range is 70 to 99 percent and
the pulse rate range is 30 to 250 beats per minute let's take a look at the app once you've installed
it simply switch on your bluetooth and then tap the o2 ring circle icon to wake it up and you'll
see your ring as a connected device alongside any other bluetooth item device you own in the app
there are four available screens let's start off with the settings screen where we can customize
and adjust the ring to our preferences the o2 ring can be used at any time during the day or night
but i mostly use it for night time as this is the time when i can pick up signs of hypoxia sleep
apnea and measure the resting heart rate which is a key input for heart rate variability measures
and general state of the nervous system aka ans for more detail into these topics take a look
into a heart rate playlist i'm a deep sleeper hence i set my vibration intensity too strong
the vibration alert is very useful waking me up if my vitals drop below a certain spo2 level
and the vibration will prompt me to wake up and shift sleeping positions you can also adjust the
reminders but i keep them to their default values as they are simply informative in nature and bring
the reminders to the dashboard just below you have the device settings adjusting screen brightness to
low or medium will prolong some battery life as opposed to using them in the high setting
let's jump to the dashboard screen this is your spot or at a point in time screen where you can
see what your spo2 and pulse rate values are at this very moment of wearing the o2 ring
now let's go to the history screen it has a list of all your sessions you can see the plots and
trends of your sp02 pulse rate and motion once you tap into a particular session above the plots you
will notice the summary screen of your particular session the key takeaways here are the recording
time the time with sp02 fell below 90 percent also note the average and lowest spo2 levels
have included a very handy gorge called o2 score which is essentially a measure of oxygen shortage
during the whole sleep the metric includes and combines frequency duration and depth of oxygen
level drops during your sleep the higher the score the more oxygen is available so the greener the
better and generally a value of 8 or over will keep you in the green zone now it's time to touch
upon data exporting for analysis or to transfer it to your medical advisor click the share button
in the top right corner of the history screen we get three options to share either as a picture
a binary file or csv i prefer the csv format as it presents the data in tabular form in 4 second
intervals that i can use to plot and compare the reading in detail to the support and smart watches
that we test and review on the Wesknows channel another point to mention is hygiene usually after
my sleep i take an antibacterial wipe and wipe inside and outside of the ring after all you
did wear it all night long the ring is ip24 so should be okay if you're using a damp cloth on
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