Features: Wide range of applications: You can apply a phone device to your cell phone, key ring, wallet, luggage, pets and other places, so you don't have to worry about not finding your beloved items. Taking little space: The weight of the pet tracking device is only 7 g/ 0.25 ounce, light and compact, effortless to pick up and carry. You can get it wherever you go or put it on your pet to prevent getting lost. Specifications: Material: plastic, electronic components Color: black, blue, pink, gray, white Size: 3.8 cm/ 1.5 inches in diameter, 0.7 cm/ 0.28 inch in thickness Battery: button battery CR2032 Package includes: 5 x Pet finder locators Notes: If the product gives an alarm, it may beep when it is connected just now, press the button again. If the beep sound occurs halfway, it means that the product is beyond the effective distance. Where is the last position of the product before disconnecting, so that it can be easily found. The doesn't have GPS, but it can help us remember the last time, because after 10 to 25 meters beyond the effective range, the device and the phone will disconnect and beep, and the app will record the location on the map before the disconnect. You can just shut down in the settings. The has an effective range of 10-25 meters, which is affected by the surrounding environment. If not connected to the phone, be sure to follow instructions