So I have a deaf cat, who happens to also be retarded. She's the sweetest girl, but it's always been so frustrating when we misplace her. She's all black, super quiet, and fast. She will jump into a cabinet before you close the door, slip into a closet while you're pulling your shirt over your head, crawl down the back of a corner bookshelf without you ever knowing, find the opening in your kitchen cabinets by the dishwasher that leads you to Narnia (all real examples). AND THEN SHE SITS THERE QUIETLY FOR HOURS IN THE DARK ACCEPTING HER ENTOMBED FATE. You can't call to her, sometimes you may even overlook her because she's black and blends in I thought one day I'd have to buy a heat sensing scope like in the action movies until I found this! No more, �oh no, where's Keebler?! I sound off her alarm, and TA DA - I've found her! Genius! And it's the same size as her ID tag, so no big deal.In conclusion, this is perfect for those items you happen to misplace and they cannot answer or come when called- be it your deaf and retarded kitty, your keys, or whatever. You could even use it just to annoy your children and have it alarm until they come to the dinner table! So versatile.