LED Display Backpack Smart Advertising Screen Waterproof PU Backpack, Size: 17 inch 1. Support points: 64x64 full-color dot matrix screen 2. Point spacing: P3.75 3. Rated voltage: 5V2A 4. Power supply mode: mobile power supply (not included) 5. Transmission method: Bluetooth 6. Support picture animation size: 64x64 pixels, 72 resolution 7. Support file format: text, picture, GIF animation 8. Material: PU leather, polyester lining 9. Applicable gender: both male and female 10. Screen size: about 25x25cm 11. Backpack size: about 30x13x43cm 12. Weight: about 1kg Features: 1. Built-in templates, free to edit content 2. Use Bluetooth to transfer data 3. The air deflector backboard supports the back and shares the pressure on the shoulders, with gaps and no stuffiness 4. Honeycomb cotton material, breathable and soft 5. Airtight two-way zipper, airtight and anti-seepage, the zipper is smooth and easy to use 6. Ergonomically widened shoulder straps fit the shoulders, comfortable and not slipping, effectively reducing shoulder pressure 7. Fine stitches, strong and wear-resistant 8. Power bank power supply, flexible and convenient, safe and stable 9. The surface is made of waterproof material, which can effectively prevent the screen and the contents of the bag from being corroded by rain 10. All-in-one all-inclusive screen film, good light transmission, waterproof and dustproof, wear-resistant and scratch-resistant