Quickly Find Items: the key finder locators can be hung on your phones, keys, bags, umbrellas, pets, cats, wallets, purses, luggage and other important items, convenient for you to find them quickly and easily, bringing a lot of convenience to your life; The tracking range is about 15 meters Convenient to Use: download the APP from the user's manual and it will work, the GPS trackers for kids are easy for your operation, and you just need to press the button for a few seconds, then the receiver will sound beeps, after that you can use your cellphone to search and connect to the device, if you lost your phone, you can double press the button, then your phone would alarm Timely Reminders: when you install these GPS trackers for dogs behind your phones, keys and other things that are easy to lose, they will sound or flash if your keys leave you beyond a certain range, informing you to find the lost items in time, besides they and your phone will alarm together when disconnecting, and this function could be turned off in setting Ample for Your Various Needs: the package includes 4 packs of kid tracker devices, sufficient for your daily application, you can also share them with others. Small Size and Lightweight: the mini GPS tracker are approx. 5.2 x 3.1 x 1.1 cm/ 2.05 x 1.22 x 0.43 inches in size and light in weight, allowing you to take them around easily without giving you much burden, so you can hang them on your kid's schoolbag or pet collar, nice for daily storage without occupying much space