1.[No monthly fee, easy to use] sends out a secure signal every two seconds for devices (cell phones, computers, tablets, etc.) to detect, receive, and upload to for 's cloud servers to generate a fixed location, which can then be viewed on a map to see its exact location. 2.[Built-in Speaker]Our tracker can help you find things nearby by playing sound to indicate the location. 3.[Versatile and Flexible]Our Tracker (for Android and for iOS) When your pet doesn't like the collar they're wearing or the collar is worn out, you can attach the tracker to any new collar. 4.[Warm Tips]for Android and for phones The item finder can only be connected to a single device, but a device can be connected to multiple trackers. 5.[Wide Application]available for dog collars, cat collars, purses, backpacks, keys, luggage. Bring convenience and peace of mind to your life and never worry about losing them again. Colour: A: As Shown (Round universal) Material:ABS Package Contents: 1 x locator (including 1 x button battery) 1 x lanyard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.