BT tracking Never worry about losing your items. When your phone or other items are misplaced, simply double-click the button to trigger a sound alert. When you're unsure where an item was left, open the mobile app to locate it. Automatic alarm helps prevent loss when the item moves beyond a certain distance from your phone, it will automatically sound an alarm to remind you. Compact and lightweight, similar in size to a coin, making it easy to carry and attach to various belongings. Two-way search function double-click the button on the device to make your phone ring, or use the app to make the device emit a sound for easy retrieval. Product Name: Smart Object Finder Product Net Weight: 21g Bluetooth Version: BT 5.0 Product Model: Y02 Compatible Systems: iOS / Android Standby Time: 6 months Effective Range: 15 meters Battery Type: CR2032 Color: Black Material: Plastic Package Contents: 3 x Smart Object Finders 1 x User Manual (English and Chinese)