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A**E
Useful low-cost tracker (including blood pressure) that needs improvements
This tracker has a blood pressure (BP) function currently absent in many and more expensive brands. Though distrustful of its accuracy, I decided to buy it for my prehypertensive father. Before giving it to him, however, I checked it intensively; my results are organized in sections that can be skipped if desired as this is a long review.TL ; DNR1. Model ID128CHM of a Chinese OEM company; has a wrong FCC identity;2. Safe radio-frequency exposure (34 times less than exclusion threshold);3. IP68 rating claim is not validated so actual water protection is unknown;4. BP values may be valid if calibrated 2x or 3x daily from a reliable source;5. Its app, a variant of VeryFit apps, has issues (a 3.5 rating in GooglePlay).SOURCEThis is one of the models of Smart Bracelets made by the DO Intelligent Technology Co. of Shenzhen (China), an OEM/ODM manufacturer and wholesale supplier. Rebranded with the mark Fitfort, registered by the importer and distributor Edgelight (Nevada), at the time of my review it was sold here by an Amazon FBA storefront. This and other tracker models of the same Chinese manufacturer are also on sale here by other sellers.SPECSFCC ID. A transmitter device [radiator] approved by the FCC must have an identification tag. This tracker has '2AHFT624' written on its underside : 2AHFT is the grantee code for the manufacturer, and 624 is the item code for the device whose specs and data were submitted to the FCC for approval by the manufacturer. This item code is wrong, however. The FCC approval for 2AHFT624 was for the model ID128C HR, which does not measure BP and comes in a different box than the model sold here. This tracker is the model ID128C HM, so its FCC ID ought to be 2AHFTID128HM, and the error violates Part 15 of the FCC rules.ELECTRONICS. Has a 3.7 V, 45 mAh lithium polymer battery with a nominal standby of 7 days, (re)chargeable via a USB2 port with a type A-like connector hidden in the strap. Uses Bluetooth Low Energy 4.0 with GFSK modulation for 40 channels, and has a low-gain antenna radiating in most directions in a short range (best case -2dBi).RADIATION EXPOSURE. Its maximum power (0.69 mW) and frequency (2.4 GHz) produces a general RF exposure value of 0.22 for distances between 0 and 5 mm -- this is ~34 times lower than the exclusion threshold for the so-called 10-g extremity SAR. Such a value represents the most severe worst-case, and highest power condition for the frequency bands used by this device in the US according to the model ID128C HM data submitted to the FCC (see above), so this is a safe gadget to wear.BODY. The display is a thin-film-transistor LCD screen with a size of ca. 1 x 0.5 in. It is hard to read outdoors in sunny daytime even at the highest brightness level available via the app. The font for some data, like BP, is unnecessarily small, whereas the font for other data, like heart rate, is quite appropriate. The body, made of polycarbonate and ABS, measures 1.6 x 0.8 x 0.5".STRAPS. The manufacturer claims the 5/8" wide straps are made of medical grade TPU, a material which does not contain plasticizers, and is hypoallergenic and flexible. The straps feel skin-friendly and soft. A cavity in the strap without the buckle covers the USB type A-like connector. Bend this strap backwards to remove it and expose the connector -- it is hard to pull out and seems a candidate for early replacement.IP RATING. The ingress protection [IP] is a manufacturing standard for defense against dust or water penetration into an electrical enclosure. Its value consists of two digits : the first rates the degree of dust protection from 1 to 6; the second rates the degree of (tap) water protection from 0 to 8. The claimed IP68 rating for this device sounds wonderful, but it is not. There is a crucial problem.The IP-water ratings between 0 and 7 completely not only specify the degree of protection but also the testing method. For example, to rate an enclosure as a 7, it must remain 30 minutes immersed in a tank of tap water in a zone between 6" [0.15 m] from the surface and 39" [1 m] above the bottom, and it must pass the criterion of 'limited water inside' (if any), and with none on live parts. But for an IP-protection of 8, the test is 'per agreement', meaning that : [ i ] the immersion time and depth are chosen by the manufacturer (unless a relevant testing standard exists), and [ ii ] the customer agrees to that when buying the product. The only proviso is that the IP test conditions shall be 'more severe' than those prescribed for a rating 7. The problem here is that neither the manufacturer nor the seller tell us how deep and for how long the tracker was immersed for the IP test, so we do NOT know what protection the tracker actually provides. Their sales pitch that the tracker is water resistant, sweat-proof, and rain-proof is woeful information for an IP68 rating claim.FUNCTIONSSTEPS & SPORTS. The walking steps are counted by the swinging of the arms, but my counts represented not only steps but repeated arm motions too in some cases, such as shifting my car's manual stick or playing squash. The sport modes I tested (tennis, jogging, cycling) gave results comparable to those of other trackers.HEART RATE. It's measured with photoplethysmography [PPG] like in pulse oximeters. Strapping the tracker at about 1" above the skin creases where hand and forearm meet, and the arm in a resting position at heart level, I got heart rates matching those from a finger on a carotid artery. PPG readings can be affected by the amount of sensor pressure on the skin and wrist movements as well as individual variations in skin pigmentation, fat layer thickness, and arterial rigidity.BLOOD PRESSURE. It is likely measured with PPG. If so, it would estimate variation in pressure and not absolute pressure, therefore necessitating a referent calibration with independent values. This is consistent with the app's request of external calibration (from, say, an oscillometric monitor) to approximate true values. Its BP readings are *unreliable* without a prior calibration and, since BP fluctuates during the daytime, it is unclear how long any calibration will remain effective. When not using the app, the standalone BP readings annoyingly vanish a few seconds after the measurement is completed, and are not retrieved when reactivating the screen.The healthy range of BP of the American Heart Association and CDC guidelines is less than 120/80 mm Hg for men and women, though a recent study suggests that less than 110 mm Hg should apply for the women's systolic range. Normotensive or not, do not expect steady values throughout the daytime or during repeated readings at any given time. Even for an experienced practitioner, there is variability in the data from arm-cuff manual measurements from a given patient at a given time. Further, in-clinic BP values measured manually differ routinely from those measured with automated devices. Furthermore, in-clinic readings, either automated or manual, usually correlate poorly with ambulatory monitoring or home-based readings. So it should not be surprisingto find variability in the BP readings of this tracker. Actually, what surprised me was to find no sharp significant differences between the data from the tracker and from an arm-cuff monitor, Omrom HEM-711, during a full day of testing that I describe next.TESTINGBased on the current clinical recommendations --i.e., 5 minutes of prior quiet rest, average of 3 readings at least 1 minute apart, sitting with uncrossed feet on the ground, and tracker at heart level-- BP was measured every 2 hours from dawn-till-midnight with both devices as displayed in one of my two figures. In each case, the averaged Omrom readings also served to calibrate the app for the subsequent set of tracker readings. Basic statistical analysis shows the pairing was well correlated (systolic r=0.68, p 0.015, and diastolic r=0.65, p 0.02) with no significant variance due to using different devices (systolic F=0.8, p 0.97; diastolic F=0.22, p 0.98); nevertheless, the very small sample severely weakens conclusions. A second figure addresses measurements repeatability, showing the respective systolic and diastolic means (the average) and their standard deviations (how these data are spread out from the mean) from repeated measurements at 6 pm with each device. Once more, data were comparable and the tracker performed acceptably well. Keep in mind that these data only apply to the device I got -- they are no proof to expect a similar data spreading with the device you get.THE APPThe tracker's smart phone app is VeryFitPro. It requires Bluetooth and GPS location turned on to bind; location can later be turned off if desired. It is distributed by Youduoyun, with IP in Hong Kong (also used by the Shenzhen DO Intelligent Technology, which likely owns it). I did not like this app, which seems a mod of the app for VeryFit devices. To judge from the reviews on GooglePlay at the time of this writing, it is a work still in progress, at least for Android phones.____UPDATE (September 2019)The most recent update of the app, v3, quite often fails to bind my device to the phone, unless I uninstall it (with the resultant loss of prior data), and then reinstall it. Updates do not seem to be thoroughly tested prior to being released. Very occasionally the tracker undergoes a paroxysmal display of multiple small-font characters when handled, lasting several seconds. I ignore what is its trigger, and I am unable to trigger it at will.____UPDATE (October 2019)The most recent update of the app, still v3, now binds the device to the phone, albeit quite slowly. The so-called "inactivity" alarm is triggered even when being active without walking, like working on a desk. The paroxysmal display fits still occur very occasionally.____UPDATE (December 2019)The most recent update of the app, v3.1 (firmware v4), binds rapidly to the phone. The various displays are also faster. Good improvement.____UPDATE (August 2020)The tracker still works as described above. The app for android phones is now v3.17. The app's binding to the tracker could be faster but remains quite acceptable. The absence of an option to display the last reading of a selected function has become increasingly annoying to my father who would like to see what was such value before using the function again. This is quite important for BP measurements, since the smallish font display turns off quickly (ca. 6 seconds) and he misses it every time he is not wearing his reading glasses.____UPDATE (February 2021)The tracker still works as described above. The app for android phones is now v3.26, and its binding to the tracker is fast. The discrepancy between BP values from the tracker and from the Omrom HEM-711 monitor (at the time when the tracker is calibrated 3x/day with the monitor) is typically of less than 15 mm Hg, with systolic values showing less difference than diastolic ones..
J**Y
impressive tracker - great price point
I have an apple watch and so this is not an apple watch - but at this price point - who cares. Both are paired to an iPhone XS max. That said, this tracker works very well. Time and heartbeat accuracy match the watch. It appears to track efficiently and accurately.I really do like the addition of the BP measurement. I have yet to compare it to a BP cuff, but it's probably close enough.Now where it does seem pretty impressive is the software that allows you to monitor all of this.Sleep tracking in this pic is off, but sleep tracking seems pretty accurate. I like the ability to track deep/light sleep, and the initial reading seem accurate. BP tracking and trend lines is kind of cool.If you pair it to an iPhone - you can track info via the health app.Additionally you have have SMS,and call alerts go to the tracker watch as well if you wish.And you don't have to charge it much - at day 2 it still says 97% battery.It won't replace the apple watch, but this is great backup/supplement to the watch.Price performance compared to the competition - this is a clear win.
T**G
The app needs some attention, but the watch is great. Exceeds Expectations.
I bought this watch at the same time I purchased a Fitbit Versa. I have a cardiac condition which prevents me from working out in extreme temperatures, so I opted to purchase an auxiliary watch with GPS, to use on the few nice days a year I can walk/run outside. I didn't really care about all of the other features. After testing both watches at the same time, I have opted to return the Fitbit. Theoretically, the Fitbit has a few more features, but none of them actually work well, if at all. The Fitfort tracked my sleep patterns automatically every night, while the Fitbit recorded one night and gave up. Everything about the music feature is frustrating, from the incompatibility issues, to the slow music transfers because the watch does not want to stay synced. Not to mention, the step counter is wildly inaccurate and the heat rate monitor works sporadically. The reason I bring all of this up is that a feature is worthless if it does not work properly or it's a massive struggle to get to work. The Fitfort may not have on board music or fancy watch faces (you can choose from a few, but they aren't much different) but it is simple to set up, simple to operate, and it is ready out of the box with exception of the blood pressure monitor. That will need calibration and you have to do it several times to get it to be accurate. It isn't difficult, however. You just need access to a blood pressure cuff, which may be an issue for some. As far as the other features go, it really has everything you need and testing it with a blood pressure cuff and taking my pulse, it's far more accurate than the Fitbit. I figured for the price, it would not amount to much, but it's a great little watch. I do think they could expand the app a little more and it would be nice if they got someone who speaks a little better English to write the English version. Most of it is fine, but there are some spots where odd placement of words makes context difficult. The watch band catch also needs to be made smaller so the excess stays in place. Regardless of any of the small drawbacks, I would buy this watch again and other products from this company. You really can't beat the functionality, for the price.
A**L
Descripción diferente
La descripción dice que mide la presión arterial y en la app no trae ningún apartado para la presión arterial solo para la frecuencia cardíaca. Prácticamente lo compre porque media la presión.
Trustpilot
2 months ago
3 weeks ago