{"id":7170,"date":"2025-08-20T19:45:25","date_gmt":"2025-08-20T17:45:25","guid":{"rendered":"https:\/\/eskerahn.dk\/?p=7170"},"modified":"2025-10-05T21:16:38","modified_gmt":"2025-10-05T19:16:38","slug":"simple-smartring-with-display-r13-review","status":"publish","type":"post","link":"https:\/\/eskerahn.dk\/?p=7170","title":{"rendered":"Simple smartring with display, R13, review"},"content":{"rendered":"

Bought another cheap smarting with display, R13<\/strong> that looks a lot like the Sy01<\/a> at first glance, but really isn’t.<\/p>\n

\"\"<\/a><\/p>\n

<\/p>\n

It is another simple one though. The main visible difference is that the LEDs and sensor-system has moved from the side.
\nAccording to ad material , like the rendering, to the bottom<\/em> of the ring BUT it is actually moved to the TOP of the ring! Under the coloured icons at the left side of the display, and flipped, so what the rendering shows is the interior flipped 180\u00b0 compared to outer. So the the LEDs light towards the root of the finger, in contrast to the SY01 pointing away.<\/p>\n

The display characters are significantly larger, and the touch area icon is changed ever so slightly, and the charging box got a lid on this one.<\/p>\n

But the difference is a bit larger. It uses different chips (same G-sensor), and another app (ECTRI)
\nThe width is the same 8.1mm and it is 0.05mm thicker (2.8mm vs 2.75). They use the same polarity on the 200mAh base so the lid is the only difference here, adding 9.25g from 21.08g to 30.33g<\/p>\n

The ring in #11 weighs in at 3.31g, versus SY01 #12 with 3.49g, so that could easily be due to the size<\/p>\n

Note that the claimed code related to the Japanese FCC equivalent is “220-JP7653”.<\/p>\n

\"\"<\/a><\/p>\n

Exactly the same as this<\/a> crappy smartwatch. So maybe it is about them using the same or very similar BT chip\/antenna. c.f. this<\/a> ???
\nPart of it made as a table:
\n<\/em><\/p>\n\n\n\n\n\n
Radio Wave Type<\/em><\/td>\nFrequency<\/em><\/td>\nAntenna Power<\/em><\/td>\n<\/tr>\n
1M21F1D<\/em><\/td>\n2402-2480MHz<\/em><\/td>\n2.5mW<\/em><\/td>\n<\/tr>\n
2M10F1D<\/em><\/td>\n2402-2480MHz<\/em><\/td>\n2.5mW<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

And a name: Dongguan Niyajia Technology Co., Ltd.<\/em><\/p>\n

But this might be interesting: https:\/\/device.report\/dongguan-niyajia-technology\/r13
\nLooks like FCC for the ring. Less than two months old FCC ID: 2BPSM-R13<\/strong>, pointing us to this<\/strong><\/a>.<\/p>\n

I have no idea if that is the producer of the devices or the BT unit, but could be the devices<\/p>\n

 <\/p>\n

Images<\/h2>\n

Here some real images of the inside<\/p>\n

\"\"<\/a> \"\" <\/a>\"\"<\/a> \"\"<\/a> \"\"<\/a> \"\"<\/a><\/p>\n

These two are pretty blurry, but do show show the light leakage towards the hand:<\/p>\n

\"\"<\/a> \"\"<\/a><\/p>\n

 <\/p>\n

Display and touch-‘button’<\/h2>\n

The display like the SY01<\/a> got three brightness levels, but is actually somewhat readable in direct sunlight, in brightest mode.
\nIt is also substantially larger the text 00:00:00 is 20\u00d75mm versus 16\u00d74mm on the SY01, so that is 20% in each direction , and thus 44% larger area!!<\/strong><\/p>\n

Pressing the button-area requires you to hold it for 2 seconds before anything happens, so not as easy to use for checking the time as the syo1, on the other hand, I got a lot of unwanted ‘presses’ on the SY01 using my hand, And this is clearly MUCH rarer on the R13 already (so likely to help the stamina).
\nThere might be some settings to tweak this delay though, but I have not found it.
\nOnce ‘on’ repeated presses cycles through Time->Steps->HR->SpO2<\/sub>->Sleep->Battery.
\nLeaving it at HR or SpO2<\/sub>, takes an extra reading.<\/p>\n

Her compared with the SY01 above the R01. Notice the light leakage to other segments in the R13. It looks worse in images than in real life due to auto-brightness, where the actually lightning is overexposing the sensor. For the same reason you do not see the difference in brightness level….<\/p>\n

\"\"<\/a><\/p>\n

Yes it is blurry, but is is quite difficult with rings on one hand to activate both displays with the other, and then grab the camera and get a focused image in the 3 seconds window, before the first activated displays goes off again *LOL*<\/p>\n

Here I tried with some extra back-light and -2EV, note the more bluish tint on the SY01<\/p>\n

\"\"<\/a><\/p>\n

It is not strong light though. The R13 is enough to work outside in a lightly clouded day, the SY01<\/a> needs shadow.<\/p>\n

 <\/p>\n

App<\/h2>\n

At first glance the ECTRI app seems to be a bit more advanced, not to say that it is better. RWfit got a 4.0 rating from less than 300 users, ECTRI got 2.7 from less than 600 users. Time will tell if the difference is fair…<\/p>\n

Though it is a REAL nuisance I get this
\n\"\"<\/a><\/p>\n

And need to press cancel every<\/strong><\/span> time I go to the main menu!!!!<\/p>\n

One thing I noticed was that HR monitoring here can be chosen with a polling frequency of 5-10-15-…235-240 minutes. I’ve chosen 5min for test, but I expect that to shorten the stamina serverly!
\nThe BP sort of admit that it is guessing by asking you to enter your ‘normal blood pressure’ initially, there is no indication of the guessing<\/del> sorry: polling<\/em> frequency, so will get back on that. But individual readings can be selected in the app.<\/p>\n

SpO2<\/sub> can be activated from the app (as well as the ring), I see no settings for monitoring.<\/p>\n

The listings I’ve seen did not say anything<\/em> on HRV , but can be accessed from the app, I can see the LED is activated and I get a reading.<\/p>\n

The listings did not say anything on stress detection , but can be accessed from the app, I can see the LED is activated and I get a reading.<\/p>\n

They got some motion controlled games, that require you to create an account, I did, and well it works…<\/p>\n

Normally on Android Location<\/em> privilege is only needed<\/em> to initialise BT connection (well known Android bug that they mixed these), and can be turned off afterwards without affecting the functionality. Not so with ECTRI! If you revoke the permissions it simply will not use BT. If you grant it the permission, but turns Location OFF in Android, the App works fine – weird bug….<\/p>\n

There is no setting on ECTRI for whether it is worn on the right or left hand. I guess they COULD determine that by looking at hand movements over a period, but most likely they just don’t optimise their algorithm with that info…<\/p>\n

See the section with compare for some images, and here a few more dumps<\/p>\n

\"\"<\/a> \"\"<\/a> \"\"<\/a><\/p>\n

Generally the app feels a bit fragile compared to the RWFit app for the SY01, It is quite unstable in its collection af the data, if not allowed to run continuously.<\/p>\n

The refresh of the data in the images seems somewhat unpredictable, but with patience data do get collected. I’m not quite sure how long the buffer in the ring is, I’ll have to do some tests with the app down for a day or two, and see what data survives, it might well be that it is a single day only. But as you need frequent charging anyway, it is not that unreasonable to expect the app to be fairly frequently opened, will get back on how<\/em> frequent is needed.
\nMy guess is that it is the sleep data that takes up most space, as it seems it blinks quite frequently. And the HR\/HRV is at the most every five minutes so it should be possible with a byte for each to hold in roughly \u00bdKB per day, if stored efficiently. (there should be no need to record over 255BPM nor over 255ms HRV)<\/p>\n

ADD: It seems to be able to record the last around 255 HR\/HRV records. So if used with the least coarse 5min granularity, this means that it only hold 21h, So you MUST have the app active in the background, or open it at the least twice a day(!). If you select 10min granularity you could expect it to hold data for 42h etc.<\/p>\n

 <\/p>\n

Shape<\/h2>\n

A ring is usually circular, I know, and the #11 cones as \u00f820.5mm, But I squeezed it a bit more flat to about 19.5\u00d721.2, and I hope this will make it less prone to rotating while the hand is active fiddling with something.<\/p>\n

 <\/p>\n

Specs<\/h2>\n

A little more specs from an AliExpress listing<\/a><\/p>\n