USB2.0 high-speed interface supports hot-swappable, USB bus-powered (4.5V-5.5V) 100% silicone material abrasion asistance,waterproof,dustproof,comfortable any logo,size and color available OEM welcom1 use:protect your u disk from abrasion,as a gift to promte friendship.2 fashionable design3 100% silicone material,insulating material.4 abrasion asistance,waterproof,dustproof,comfortable5 any logo, ...