I am so glad to report that the Blood Pressure and ECG features on this device.really do work as advertised and that makes this worth the price.There are many cheaper fitness trackers out there, but not ones that are equipped with the correct chips to be able to accurately read BP from your wrist and do ECG test!As for the other features... The Heart Rate is very accurate.Steps are like all fitness trackers (FitBit, Garmin, whatever) in that they are approximate and not exact- this seems to be fairly accurate on that. It also does a good job of guessing your distance based on your height and # of steps (it does not have gps).Sleep monitoring seems to be very accurate or at least as accurate as any of the other sleep monitoring fitness trackers I've had over the years.It also gives you an approximate calories burned based on steps and your info.You can also have the app send notifications such as text messages, whatsapp messages, and others to your fitness tracker.I could never get the ecg to work.It was weird when I used to measure the O2, HR, Blood Pressure, all the time I saw almost the same results.That was kind of weird for me, only until I started noticing something bad about this device.1.- When walking on the treadmill my HR always kept in the same range ( between 80 to 90 ) which is not true, because after doing my cardio for more than 20 minutes, it's impossible it keeps in that range. I compared it in my treadmill and my HR achieved the minimum 110 to maximum 160.2.- the O2 and blood pressure, wow, this was the most disappointing and frustrating thing. this is what I did: I did several testings by measuring them with NO watch wore in my wrist!, the outcome? it showed fake results.It is impossible that by no wearing the watch, it keeps showing good results on O2, HR and blood pressure.so not only frustrating, I felt I loose my money because this watch works only for knowing the timeI need to State something: This is my case after several months of using it and testing it, it was the same thing since the beginning, not sure if this is happening in generalI had this product for 2 months then 1 side of the band broke I sticked it with some epoxy. Then the opposite side of the band broke tryed to stick the other side but is not working. The aluminum frame is cheap thus the pins of the band can break the frame. Was a good product otherwise but now its useless going to have to but a different one this time.Bought it as a gift and didn’t work doesn’t chargeCan’t contact sellerThis tracker does what it is advertised to do with no apparent flaws. What I like the most about the tracker is customer support which is lacking in two other brands I have tried. Grace, my customer service rep, has been happily guiding me in in any questions I have had. I give Grace and the tracker five stars.I received my fitness tracker on time. But there was no charger in the box. I made a call to Zeerkeer and they sent another tracker immediately. Easy to use, high quality.It only worked for a few days. The battery life is rather good, but now that the battery went dead, I tried to recharge it. All I can see is a small green spark on the back of the unit, and even though the magnet latches on, it downs seem to charge the unit. I had it plugged in for 12 hours now, and the unit is still not turning on. I must have gotten a defective model. My daughter is disappointed. I’m taking her to Costco today to look at a Fitbit.Hasta ahora todo bien en términos generales.No tiene pantalla touch y el sensor a veces cuesta trabajo que reaccione. Su traducción al español es terrible aunque funcional, su app podría ser mucho mejor. Su instructivo no sirve para nada, todo hay que buscarle.En general hay mucha oportunidad de mejorar y su relación calidad precio es mala a comparación de otras pulseras como la mi band 4.A pesar de todo, el contador de pasos funciona y el monitoreo de pulso y presión arterial también, si estás buscando SOLO monitorear esos 3 (principalmente la presión arterial) es una buena opción.As expected, but I’ve only had the tracker for a week. Relatively easy to set up but when instructions are translated into English it would be nice if the translator had a bit of a grasp of English grammar. (True for most instructions that do not originate in North America). Fit and finish are great and the accuracy is far better than I expected. The step counter is pretty bang on and the heart rate and blood pressure are fairly accurate. I have not yet calibrated the tracker with my doctors professional tools. Thanx for a good product so far.The app was easy to install on the phone and synced with no problems to the braceletIn addition to the advertised items it also does a respiratory check with breaths per minute on the phone app.I like what this tracker all does and very happy with the purchase of the Zeerkeer fitness tracker.Battery last about three days before having to recharge for me and in a tussle with a dog the band came of the tracker and is giving a wee bit of grieve. But we will blame the dog for that one!!Does not maintain settings of phone calls and emails notifications, find phone function does not work had to use iphone health app to get readings to appear in fit app for device . Device manual does nothing to figure out how show correct charge level, need turn device off to reset battery charge icon to show full chargeThis watch did not disappoint. The mobile app works great. Data always is sent to the app from the watch. It includes... blood pressure, heart beats, sleep tracker and more. Now I have a history of data that is building day by day. Thanks. Good product.