Smart Bluetooth GPS Tag Tracker, Compatible with Android/iOS Apps, Anti-Loss Reminder Function, Anti-Loss Measures, Car Keys, Pet Locator This is a set of 3. This anti-loss device is a product based on Bluetooth technology. By connecting to mobile devices such as smartphones using APP software, it links items and valuables that users tend to lose (such as keys and handbags) together, realizing an item loss prevention reminder function. Find your phone and take photos remotely (for taking photos at parties, selfies, etc.). *Does not support Apple "Find My". *The enclosed instruction manual is in English only. Although unused, the packaging plastic bag has some damage.