Let me start saying that I hate to wear any wrist accessory, including bracelets and watches….or even rings. Possibly not being a good candidate for wearable monitors I expect more may be? I bought this smart watch only for one reason, I wanted to check my sleep pattern to see all the different phases of my night sleep. If you are looking for a review of a wellness device this is for you. I wore it asap I received it. I Downloaded the app and sync it. I wore in on left side (that is where I measure my BP with a traditional cuff). Although I expected not to be accurate as a blood pressure monitor…..I assumed at least the sleep pattern function had some accuracy. I wore the watch for 18 hrs and tested steps and all functions related to wellness. Lest say that none of the functions listed for wellness will be ever accurate enough in any of these devices for the time being. Consider that an Oxymeter needs to read on finger not on top of the wrist and that a regular blood pressure wrist cuff lacks of accuracy as well. So, you cannot expect this type of accuracy from any wearable monitors. However based on movement and HR (heart rate) I thought it would give me some sleep pattern precision. It did not even registered the 2 times I woke up at night to pee. It just gave me a total of hrs sleep split in Light sleep and Deep sleep. Not enough details for me on the app graph. It also did not register my HR at night, or it failed to display it on the app screen on phone. Hearth Rate function overall sucked too. It gave me a reading of same HR for resting, minimum and maximum. The timer and steps functions are useless to me…..I already use the sensor of my samsung phone. I cannot be bothered with the timer for the aerobics, I always used a traditional chronograph stop watch for training. Other functions such as music and messaging or phone calls I cannot write a review on those. In summary if you are using this as a wellness monitor, do not buy it because it will give you very inaccurate functions like O2, Blood Pressure, HR recording (through the night) and Sleep Pattern important details.