1EYE SHAPE: This LED sign conceal a pair of mysterious and dreamy eyes. If you walk through a crowd with it, you'll be the center of attention, just like a scene in a movie 2POWER SUPPLY METHOD: This LED sign need to be connected to a power bank to be used, powered by a mobile power supply(not included) plugged into the USB data port on the back 3APP PROGRAMMABLE: The display can then be connected via Bluetooth to the for SPOTLED APP to freely edit text, animations and pictures, very flexible 4MULTIPLE USES: LED eyes single eye size is about 5.31x2.95 inches, dream shine, support text, pictures, GIF and other formats; You can install on a backpack, shirt, vest, car or motorcycle 5COOL GIFT: LED knight backpack come with screen, is also the best gift on Christmas, birthday, Valentine Day to give yourself or others, very versatile Item Type: Programmable LED Sign Application: For SPOTLED APP(available for download on for App Store) Supported Systems: For Android, for iOS Power Supply: USB interface Communication Method: Bluetooth Left Right Eye Screen Resolution: 32x64 Single Eye Size: Approx. 13.5 x 7.5cm / 5.31 x 2.95in 1 xProgrammable LED Sign Have a great time shopping!