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small size is suitable for women and children large size is suitable for both men and women Small size: Backpack size: 32.7*18*42cm Backpack material: ABS, PC, 1680pvc Screen count: 48*48 on one screen Screen point spacing: P2 Power supply mode: mobile power supply (you need to configure the mobile power supply) Communication method: Bluetooth Weight :1.5kg large size: Size: 36*18*48CM Product name: LED locomotive bag Material: ABS+PC Power supply mode: mobile power supply (customer configuration) Voltage: 5V/2A Support picture animation size: 48*48 pixels Support: text/picture/GIF/animation Left eye size: 7*10.5*9.5*6.5CM Right eye size: 6.5*10.8*9.5*7CM Weight: about 1.7KG waterproof Connection method: Bluetooth Download APP connection 3D hard shell design Freely edit DIY, pictures, animated pictures, text LED travel safety Travel safety at night (LED display) 15.6-inch laptop Product Features:Backpack with Display,Technological sense, trend Highlights:Smart APP Control,wifi backpack Product Category:Pixel Bag,Smart Backpack,Pixel Bag,led backpack 1: Mobile APP control can change the display of text, pictures, animation can be displayed in a variety of ways. 2: Products do not contain power, they need to have their own mobile power supply or other power supply mode 3: Any scene is played at any time, personality shows cool, pleasing to the surprise effect. Packing list: 1* Backpack, 1* English manual