1.Bluetooth: 5.0 2. Material: ABS 3. APP: iSearching / Kindelf 4. Working distance: 0-15 meters 5. Product size: 38*38*7mm 6. Mobile phone system: IOS7.0 or above, Andriod 8.0 or above This anti-lost device is a product based on the new low energy consumption Bluetooth 4.0 technology. Using "iSearching" software APP to connect with mobile devices such as cell phones via Bluetooth, it can store items and valuables that users are easy to operate. lose (such as keys, keys, etc.) handbags, etc.) are grouped together to realize the anti-lost items reminder, mobile phone search function, and also realize the photo taking functions and remote recording (eg: group photos at parties, selfies, etc.). The effective distance of this anti-lost device can reach up to 15 meters in an open range, and you can even use it on babies or pets, so you don't have to worry about losing them anymore; The battery needed for this anti-lost device is a CR2032 button battery which needs to be purchased alone.