Features: Lanyard buckle design, easy to take away when traveling. When the pet goes out and wears it on the neck, when the pet exceeds the set distance, it will immediately call the polices so that the pet will not be lost anymore. Lightweight and portable, two-way reminder, one-key search, start anti-lost life. Made of ABS material, the surface is skin-friendly and smooth. The ultra-thin design and the smooth and delicate hand feel will make you love it. Precise positioning, easy to find items. The effective use distance of this anti-lost device can reach 20 meters in an open range, and even you can use it on babies or pets, you no longer have to worry about them being lost. 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 Size:About.4.4x3.85x1.2cm/1.73x1.51x0.47inch Color:White/Black/Green/Pink Package Includes: 1x Bluetooth-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. Thanks for your understandings.