It is a kind of Bluetooth low-energy product which based on the newest Bluetooth 4.0 version. It can chain user's easy-lost and valuable belongings (such as keys, handbags etc.), kids or pets together with smart phones through specified App software within a setting Bluetooth connection distance. In the effective distance it can realize the functions of anti-lost, looking for smart phones, self-portrait and voice recording. With this device, your belongings, kids and pets won't leave your attentions any more.Features:Bluetooth 4.0 technology ensures stable connection with almost all smart phones through a specified APP.Bi-direction anti-lost alarm for phone and the device, prevents your kids, pets, belongings from losting.It can provide a last seen pin-drop on map via APP to help recover your items or search car in parking site.The smart finder Bluetooth Locator can also be selfie shutter for taking pictures and support voice recording.The wireless working distance is about 10 meters in the open air. It is a practical accessory of daily life.Specification:Material: PlasticBluetooth: V4.0Support System: Android 4.3 and iOS 7.0 aboveEffective Distance: ≤10mBattery: Built-in CR2032 Button CellColor: Black, White, Blue, Green, Rose Red (Optional)Main Item Weight: approx. 7g / 0.24ozMain Item Size: approx. 3.6 * 3.2 * 0.8cm / 1.41 * 1.26 * 0.31inPackage Weight: approx. 9g / 0.33ozPackage Size: approx. 7.0 * 5.0 * 1.0cm / 2.75 * 1.96 * 0.39inPackage List:1 * Bluetooth Tracker1 * English User Manual