Black color Quantity: 1 piece Size: 40 * 7.2mm Note: 1. The actual color differs significantly from the image due to the different monitors and light levels 2. Deviation may occur due to the manual measurement Two-way notification. When the tracker is out of effective range, both the tracker and your phone will emit a sound to remind you and help locate each other. Smart tracker. Attach the BT tracker to everyday items such as car keys, baby bags, wallets, or pet collars, then use our free app (compatible with both iOS and Android). GPS tracking. View the location where the BT device was last detected through the app map to help you find lost items or locate your car in a parking area. Remote control via app. Download the free app and pair it with your phone. The BT tracker will emit a sound when you press the button in the app within a range of up to 98 feet (Open Space). Lightweight and portable, easy to carry like a keychain, attach to bags or pet collars.