This is a USB to PS/2 adapter for a mouse. This type of adapter allows a user to connect a USB mouse to a computer with a PS/2 port. It supports plug and play installation. The green color and mouse symbol indicate it is specifically for a mouse. It can be a cost-effective solution to bridge legacy PS/2 peripherals with a modern, USB-capable computer. The adapter is bus-powered, meaning it draws power from the USB port.