Product specifications and features. Brand new and high quality bluetooth anti lost alarm. Alerts direct to your smartphone. Compatible for devices with Bluetooth. Easy operation, with an English manual to guide. Your phone by pressing the button on the gadget it will send the phone a ringing noise until you locate your phone. It can trace the easy-lost and valuable belongs, such as keys, handbags, pets, phones and etc. Effective distance: 75 feet in the open air without barrier. Bluetooth version: 4.0 Material: Plastics Length: 4.9cm Diameter: 2.8cm Thickness: 0.8cm Package includes. 1 x New Smart Bluetooth Anti lost alarm Tracker GPS Locator kids Wallet Key Pet Dog