This anti-lost device is characterized by hanging hole design, which enables it to be easily hung on the keychain to make you carry conveniently. There are many appealing features of this anti-lost device including two way alarm, breakpoint location, location record, selfie function, DND mode, disconnect alert, loud sound, low consumption, long standby time and so on. It is made of high-quality ABS and acrylic material. The length of the product is 4cm, the width is 7.2cm. It is suitable for home, dormitory, office, indoor, etc. Item Name: Anti-lost Material: ABS,Acrylic Battery: CR2032 Button Battery(Included) Features: Anti-lost, Two Way Alarm, Selfie Function, Disconnect Alert Size Details: 4cm x 7.2cm/1.57" x 2.83" (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. How to Use: 1. Cell phone finder: the anti-loss device and valuables bound together, when the device and cell phone APP Bluetooth-compatible is connected, use the APP search function to make the anti-loss device sound, so as to find the item. 2. find the phone: when the device and cell phone APP Bluetooth-compatible is connected, need to find the phone, double-click the device button to call the phone, the phone will sound. 3. Two-way alarm: Open the "anti-loss reminder" function inside the software, which can realize two-way anti-loss. When the device and the cell phone APP Bluetooth-compatible is connected, if the phone and the anti-loss device Bluetooth-compatible disconnected, the phone and the anti-loss device will sound an alarm, items lost cell phone, the alarm to remind. 4. Self-timer: when the device and cell phone APP Bluetooth-compatible is in a connected state, use the software self-timer function to take pictures wirelessly. 5. Breakpoint Positioning: when the item with the cell phone APP Bluetooth-compatible disconnected, APP will record the item disconnected after the lost location, disconnected after the lost location in the APP inside the map inside the display. Package Includes: 1 x Anti-Lost Device