Works less than half the time on several different and up to date devices like note 20, Samsung galaxy s9, iPhone 12 max...we also purchased a Motorola with Android system that came out 6 months ago and it doesn't work at all on that. So not only do you need a new, expensive device to get the app to work, but it also only works less than half the time. Most ppl with type w are diagnosed as children so why require such expensive compatible devices?