For Air Tracker Tag with Lost Mode: Set Lost Mode for your Bluetooth tracker tags. When bound to your phone, the tags cannot be paired with a new device. If someone finds your item, they can view your contact information. Additionally, when detected by a compatible device, it automatically updates its location. Lost Reminder: When the tracker exceeds Bluetooth range, a notification appears on your phone. If you have already moved away, you can use the "Find My" app to view the last known location on the map. Color: Black Material: Plastic Package Contents: 4 x Hidden Holder Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement error allowance is +/- 1-3 cm.