Features: brand new and high quality If you forget where you put it, double-click it to retrieve it easily. Lightweight and compact, easy to pick up and effortlessly. Lightweight and portable, two-way reminder. The APP is powered off and locates. When the mobile phone and the item exceed a certain distance, the item will sound an alarm to remind you to retrieve the lost item. Bluetooth-compatible compatible for smart alarm to prevent loss. When the mobile phone or other items cannot be found, double-click the anti-lost device, and the mobile phone can emit a warning tone. Specifications: Material:ABS+Button Battery Size:Approx.3.7x3.7x0.5cm/1.46x1.46x0.2inches Color:Black/Dark Blue/Light Pink/Orange/White Package Includes: 1x Round Bluetooth-compatible Compatible Anti-lost Device note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.