You can't even use this device until you install the app on your phone and the app doesn't work AT ALL until you give it some permissions. including permission to MAKE TELEPHONE CALLS. I can understand that you need to let him change the data on your phone (so that he can save his own test results). but I will not allow such an app to access my CURRENT LOCATION and MAKE PHONE CALLS to even get started! This is utter nonsense. By the way, both this device and the required application are made in China (this fact is not hidden). The included instruction manual is literally littered with broken English. I sent it back as soon as I stopped laughing. Next time I will do more research before buying something like this. Unfortunately, Revain does not currently provide this information.
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