Explain High Quality: Bluetooth 5.0 technology, low power consumption, button battery, standby time more than 10 months, easy to replace. Two ways: You can connect to your phone's Bluetooth function. When the Bluetooth range is exceeded, the mobile phone and the anti-loss device will alarm at the same time. The service distance is about 10-25m. (Internal and external decisions) Dog tag design: beautiful and modern appearance. There are eight main colors (white, gray, dark blue, black, green, pink, red, and sky blue are optional) depending on the main character. Widely Used: for pets/luggage/handbags/children, etc. to prevent loss and protection. This is a great gadget that can help you search and find. Compatibility: when you disconnect the device from the phone, you can view the map location; Compatible with iOS system and Android 4.3 or later (requires Bluetooth 5.0). Material: ABS Size: 42.40.10mm Applications: Search Stack: Button Stack (CR2032) Shipping Quantity: 1 piece Welcome