On the activity meter of adeVital we very pleased. Unfortunately, our old meter was not a device for the wrist, but had to be transported on a belt or in your pocket. The unit was as always delivered very quickly from Amazon and even the packaging was not wasteful. If you have unpacked it carried the short & easy setup. After you have entered a few basic data and the device with the corresponding App has connected to the iPhone it can also almost ready to go However, here comes the first point deduction. To properly set the counter to the extent necessary to the wrist strap with a pair of scissors !! cut to the correct length. This is not very useful because although my bracelet super fit, but my partner can not use it, since it is then too narrow for him. But now it goes to the first tests. On the first day I wore it to my daily steps to count. Earnings evening was amazing & the transmission of data on the iPhone ran smoothly. On the second day I doubted the results then something on & made on the third day then the experience that the device does not count exactly. I consciously went 2x 500 steps (counted in the head although there is a pedometer on the arm). The first figure was 471 steps, the second value at 524th This result is unfortunately too vague for me. So I can not really trust also the calorie consumption. But as a positive feature I have to add that the comfort is very good & I do not feel the device during extended disturbing. The two stars, I prefer the following reasons: - Inaccurate measurements - Bracelet unfortunately can only be set to a size - No Android App Although (use even an iPhone but in this day and age you need for all common systems can deliver the respective Apps) Therefore unfortunately only conditionally recommended!