BT tracking Never worry about losing your items. When your phone or other items can't be found, simply double-click the button to trigger a sound alert. When you're unsure where an item was misplaced, open the mobile app to locate it instantly. Automatic alarm prevents loss When the item moves beyond a certain distance from your phone, it automatically sounds an alarm to remind you. Compact size, similar to a coin, making it easy to carry and place in various locations. 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 quick retrieval. Product parameters: 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)