Feature: 1. Bluetooth APP Control: According to the user manual, download the APP, which is controlled by the Bluetooth connected APP. The APP has many interesting patterns and animations built in, and it will be constantly updated and upgraded. 2. Powered by Battery: The LED sign is light and thin, with a flexible board design. It is directly powered by a 250mAh polymer lithium battery and can run continuously for 4 hours when fully charged. Micro charging interface. 3. DIY Design: You can DIY design text, pattern, animations, and more to meet your needs. You can also adjust brightness and display mode. 4. Easy to Install: LED display with small battery pack power supply, can be installed on hats, backpacks, shoes, cabinets, and can also be attached to car windows or other objects. 5. Wide Application: The LED sign is widely used in car advertising, as well as in shops, bars, game rooms, cycling, Christmas, Halloween, parties, birthdays, and more. Specification: Item Type: LED Matrix Panel Product Size: Approx. 155 x 33mm / 6.1 x 1.3in Internal Battery: Polymer lithium battery 3.7V 250mAh, included. Light Source: Green Light Material: Electronic Components Charging Method: USB Micro Control: Key Switch Programming: Bluetooth APP Weight: 43 g / 1.52 oz(approx.). Package List: 1 x LED Matrix Panel 1 x User Manual1 x USB Cable