Filo is a Bluetooth Tracker which works with a free app available for iOS and Android. Simply attach Filo Tag to the valuables you dont want to lose or forget. Find items: Connect Filo Tag to the app and you will be able to ring your items from your phone when you get close. Find your smartphone: Simply double press the button on Filo Tag and make your smartphone ring, even if its in silent mode. if it is outside the Bluetooth range you can view the last seen position. Using the Separation alert feature you can receive a notification on your smartphone every time you leave your valuables behind. Replaceable battery lasts 1 yr (CR2032) 97db volume. 80 meter range.