Was recommended by a customer that these were good. So far I haven't lost anything, but I do like how I can replace the battery when the time expires in a year. It's easy to set up, I have my Bike, Car, House Keys & Wallet all linked to the app, so it makes life a lot easier.
The delivery of this product was exceptional with it arriving within a few days. I have an open plan house that is larger than most normal houses. I was able to hear and locate the tile from 35m plus away. The usage of the concentric circles for distance is a good idea though I have been able to hear the ring tone to date.