Specification: Material: ABS Appearance size: 52 * 31 * 11MM Applicable system: IOS 7.0 and above, Android 4.4 and above Product colors are: black, white, red, green, blue, pink Note: APP application download: Download the application library in the Android system, download the application library in the ios system Bluetooth version: Bluetooth 4.0 Battery: CR2032 lithium button battery (included) Working distance: about 75 feet (accessibility) using Bluetooth Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.