Duffy is a system that can be installed on a USB flash drive, a small mainframe or an old notebook. It can play local files and various audio format files of the network disk, connect the network cable or use the wireless network card of the body to access the network, and then input the ip address of Duffy system in the same local area network through other computers, mobile phones or any equipment with Internet access through the browser. You can choose music, install plug-ins and make playlists after logging in.