Put tracking stickers on objects that you lose often, like keys, phone, wallet etc. Tell the app on your device what THAT sticker is on ("car keys"). Then when you need to find it, use the app to find that sticker (and your keys).
Pensato per TEa! SlingsHOT Tea Cup by Samir Sufi. The slit in the handle keeps the tag from falling in and allows the user to squeeze the liquid out of the soaked bag simply by pulling back as you would a slingshot.