Welcome to our store! Bluetooth APP Control: Download the APP according to the user manual, controlled by the Bluetooth-connected APP. The APP has many interesting patterns and animations built-in, and it will be constantly updated and upgraded. Battery Powered: 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. DIY Design: You can DIY design text, patterns, animations and more to meet your needs. You can also adjust brightness and display mode. Easy to Install: LED display with small battery pack, can be installed on hats, backpacks, shoes, cabinets, and can also be attached to car windows or other objects. 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. 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.) 1 x LED Matrix Panel 1 x User Manual 1 x USB Cable