Totally useless. Do not buy absolutely
The idea was promising and I even invested in the crowd funding. But after I got the products, all of them stopped working after few months and The app does not see them at all while I have those craps just on my sight. I think the quality of the products is actually very low and the promise is absolutely not me, not even a bit. Stark should be ashamed today for having participated to this total scam. This is a pity and a shame. So stay away from this useless product