How to use: There is an app two-dimension on the package, you just need to scan the code with your phone, then download the app. Open your Bluetooth. Open the software and register. Connect the nut with your phone. Link the nut with your goods. Then you can monitor your goods. You don't need to be online, just open your Bluetooth, and the alarm could work. Compatible with: iPad 3/4, iPhone 4S/5/5S/5C, iPad mini, iPod touch, Samsung Galaxy S3/S4/Note2/Note3, Nexus4/5 and more... Specification: Bluetooth 4.0 Anti Lost Alarm for apple(IOS) and Android products especially, and to protect pets, kids, mobile phone, laptops, luggage and other assets from loss. With camera remote shutter. Communication Standard: Bluetooth 4.0 low energy wireless technology. Search Range: 15~25m(Distance will vary depending on terrain and other factors). Product dimension: 3.7x3.7cm. Packing dimension: 9x1.5x13cm.