Feature: 1. Bluetooth APP Control: This sign supports APP control, downloads the APP and connects to Bluetooth, with many interesting patterns and animations, and will be constantly updated. 2. Flexible LED Screen: The LED sign screen is flexible board design, light and thin, and can be installed on hats, backpacks, shoes, cabinets, attached to car window or other objects. 3. Battery Powered: This LED sign features a built in 3.7V 250mAh polymer lithium battery, and equipped with a USB cable for charging, making it easy to use anytime, anywhere. 4. DIY Design Function: You can DIY design text, graffiti, animation, etc. on this programmable sign to suit your creation style, and you can also adjust the brightness and display mode. 5. Wide Applications: This LED sign is widely used for car advertising, shops, bars, game rooms, cycling, or Christmas, Halloween, parties, birthday, and other holiday decorations. Specification: Item Type: Programmable LED Sign Lamp Board Size: Approx. 170 x 70mm / 6.7 x 2.8in Weight: Approx. 60g / 2.1oz Built in Battery: Polymer Lithium Battery 3.7V 250mAh (included) Light Source: RGB Material: Electronic Components Charging Method: USB Micro Control: Key Switch Programming: Bluetooth APP. Package List: 1 x LED Sign1 x User Manual1 x USB Cable