Description: Compared to other similar products on the market, our smart tracker is connected to the phone via-Bluetooth-compatible. You can observe exact location through App. With help of this product, it helps you find keys, wallets, remote controls or purses accurately and quickly. Practical smart tracker has lightweight and compact size design, which is portable and has wide application. You can carry it in your backpack. It is constructed of ABS material. The smart key finder comes with a built-in CR2032 button battery. It can last for up to 12 months and easily be replaceable. You can just click the Call button in the App or the Beep button on the phone, this Bluetooth-compatible finder will beep and lead you to find them. If you forget where to place your phone, you can double-click the button on the connected finder, your phone will ring even when it is on silent. The length of this product is 3.8cm, the width is 3.8cm and the height is 1cm. This anti-lost device is characterized by metal ring design, which enables it to be easily hung on the keychain to make you carry conveniently. When the device is connected to the mobile phone APP Bluetooth-compatible, use the self-timer function of the software to take pictures wirelessly. Double-click the switch button of the device to record in the APP. As long as the item is out of range (25m), your smartphone and this keys finder will both beep to alarm you. It is not easy to leave behind your keys at the restaurant again. Once your items went out of range and were lost, the App will automatically record the last place where this key finder is disconnected from your phone, so you can speculate approximate location based on the last recorded spot shown in the App map to find your missing items. Item Name: Smart Tracker Material: ABS Power Supply: CR2032 Button Battery (Included) Sound Reminder Decibel: 80DB Bluetooth-compatible Version: Bluetooth-compatible 5.0 Usage Distance: 25m Compatible System: for iOS11.0, for Android8.0 (above) Suitable for: Phone. Key, Bag, etc Features: Anti-lost, Two Way Alarm, Selfie Function Size Details: L: 3.8cm/1.5", W: 3.8cm/1.5", H: 1cm/0.39" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Smart Tracker 1 x Metal Ring