Product name: Round Bluetooth anti-lost device. Product net weight: 10g Product gross weight: 24g Material: Acrylic/ABS Product size: 42*42*8mm Color: black + white + blue + pink Quantity delivered: 4 pieces Battery: CR2032 button cell APP: isearching 【Geofence Zones 【Customizable】The safety fence system lets you know if your pet is in a safe zone. You can set a safety zone, where you think the animal is safe and protected. Use the app to plot safety zones around your yard or favorite park, and receive instant alerts when your dog has exceeded these limits. 【Real-Time Bluetooth Dog Collar】 The Bluetooth tracker works with the system of Bluetooth, WiFi, AGPS, LBS and long distance wireless technologies. Animals wearing the tracker can be tracked and traced precisely. The tracking location is updated by sending SMS and it is displayed on APP and Internet. The navigation accuracy is within 10 meters range. Always know the exact location of your pet with precise GPS ! 【Easy to use】The Bluetooth tracker is easy to install and use. Simply download the free app and follow the instructions. With the app, you can see your pet's activities and pinpoint its location at any time. With the remote voice monitor, you can call them at home, reassure them when you're away, and hear them respond. Note: There is a protective film on the product screen, which can be removed before use. 【Waterproof and Mini Size】The pet tracker is able to work even in rainy days thanks to its waterproof design. The tracker is made of ABS material which makes the device durable, which is also environmentally friendly. The tracker is able to fit any type of pets as it is small and lightweight. The built-in large capacity battery can be charged by USB and it takes about 2-3 hours to be fully charged. Welcome to meet