4 Item Finder - This key finder is very convenient for people to use. After downloading the app "Search", you can set it up on your phone. Long press means on/off. Search for Android and devices EASY TO CARRY - We equip each key tracker with a buckle for easy carrying of keys or bags. When out of Bluetooth range, use the app to see your nearest location on a map. Find your phone - when bluetooth is on, double tap the tracker's button and the phone will make a sound Versatile - Great for keys, dogs, cats, school bags or purses. What a smart tracker Once you have our key loss prevention, you will your belongings Colour:black+white Material: ABS Package Contents: 4 x Keys Locator 4 x Ring 1 x English manual Only the above package content, other products are not included. Note: Light 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.