Function：Used for data transmission and charging expansion, widely used on Printer, Scanner, Fax Machine, etc. (This product is for converts your USB B female port into a USB A female port, please make sure this is what you need before ordering!!! Won't work for midi electronic musical instruments!!!) | Easy to Use：Plug and play, no software or power required, a very convenient way to connected computer and printer. (This product is for converts your USB B female port into a USB A female port, please make sure this is what you need before ordering!!! Won't work for midi electronic musical instruments!!!) | Fast：USB 2.0 design, transfer speed up to 480mbps; charging current up to 2A. (This product is for converts your USB B female port into a USB A female port, please make sure this is what you need before ordering!!! Won't work for midi electronic musical instruments!!!) | Durable：Nickel-plated USB plug enhanced signal transmission stability, oxidation resistance, corrosion resistance. (This product is for converts your USB B female port into a USB A female port, please make sure this is what you need before ordering!!! Won't work for midi electronic musical instruments!!!) | Material：Made of high quality metal and PVC materials, good electrical conductivity, durability and easy to use. (This product is for converts your USB B female port into a USB A female port, please make sure this is what you need before ordering!!! Won't work for midi electronic musical instruments!!!)