I am using it for Steps, Sleep, Heart Rate, Timing of Aerobic/Yoga Activities, and Receiving Texts. It’s got. A little screen relative to an Apple Watch - but I didn’t want something large and clunky. The smaller size does mean it doesn’t do absolutely everything - but so what. I love that I can check my heart rate while still in bed (this is an important indicator when you are upping your exercise regime). I was pleased to see just how many steps I am taking each day as I am not a person to carry my phone everywhere and my steps were being under-counted. I love getting a wrist vibration for texts (I can turn off my phone notifications and not miss anything). The sleep function is basic but gives you essential information. I have found the app to be quite straight forward but reading the app screen on my IPhone for things like Sleep is a little hard because the layout is set for a young person’s vision. Now that I Have used the device, and learned to interpret the data, I no longer find the small print a nuisance. BTW, I have compared the heart rate and steps data with other measuring devices and gotten similar readings - so I feel it is accurate. I have also linked it to my iPhone’s Health app so I have a place where my data, except sleep, is displayed in a slightly better format. This unit is a bargain and I am recommending it to my friends.