Feature 1、Smart Tracker. Attach BT tracker to daily items such as car keys, kids\u0027 bags, wallets or pets\u0027 collars, then use our free app (Support both iOS and Android system) to track them. 2、APP Remote Control. Download free APP, then pair it with your phone. And the BT tracker will generate \"beep\" sound when you press the button via APP within 98 ft (Open Space). 3、Two-way Notification. When BT tracker and your phone are out of effective range, both your phone and tracker generate beep sound to remind you and help you track it back. Feature: Smart Tracker Attach BT tracker to daily items such as car keys, kids' bags, wallets or pets' collars, then use our free app (Support both iOS and Android system) to track them. APP Remote Control Download free APP, then pair it with your phone. And the BT tracker will generate "beep" sound when you press the button via APP within 98 ft (Open Space). Two-way Notification When BT tracker and your phone are out of effective range, both your phone and tracker generate beep sound to remind you and help you track it back. Easy to carry This tracker is small and lightweight, easy to carry like a key chain hanging on your kids' schoolbag or pet's collar. GPS Tracker It displays location where BT disconnect via APP to help you find your items or search your car in parking site. Multifunctional Design It can also work as a remote shutter for selfie, so you can press the button to remotely control camera of your phone. Specification: Color: Black, White, Blue, Pink(Optional) Material: Acrylic & ABS BT version: V4.0 Battery capacity: CR2032 APP: iFindU Compatibility: iOS 9.0, Android 9.0 and latest version Item size: 40* 40* 7.2mm/ 1.57* 1.57* 0.28in Item weight: 8g/ 0.28oz Packing list: 1 * BT Tracker Package List 1 * BT Tracker