Chipolo is a Wireless Item Tracker that lets you monitor and find your stuff. By using the Free App on your Bluetooth enabled Smartphone, you can track up to 9 Chipolos to help locate your lost or misplaced items. The Chipolo comes in Nine Fun Colors so you can use a different color for each item that you want to track. A Chipolo is about the size of a coin and less than 1/4 inch thin. And the smooth plastic design makes it feel as good as it looks. Chipolo is the Perfect Fashion Accessory because it's not only portable, it's wearable, too! You can use the included Split-Ring to attach your Chipolo to your Home or Car Keys, Purse, Wallet, Backpack, Cat, Dog - you name it. Chipolos have a Range of Up To 200 Feet or 60 Meters (depending on walls and interference), thanks to its custom antenna design. Even when they are out of range, the Chipolo App remembers their last location, which gives you a starting point to retrace your steps. And the built-in Temperature Sensor gives you an idea if the Chipolo is inside or outside. Plus, you can allow up to 3 Friends, Family or Coworkers to use their Smartphones to track your Chipolos. Chipolo uses the Bluetooth 4.0 Low Energy standard so the replaceable battery can last up to 6 months. And since every Chipolo comes with a extra battery, you are covered for 1 year. After that, it is very easy to replace the standard CR2025 battery, which can be purchased at many general stores.