... music,with high-powered loudspeakers,long time playWith line in function,can switch-in Notebook PC,MP3,MP4,Ipnone etc..Build ... -in flash memory,can storage large quantity music and dataFull function All in One port design,All external using single portFull ... (optional)Storage Capacities:1GB,2GB,4GB,8GBIterface Transport:USB2.0 Full speedSystem Format:FTA16/FAT32Audio Format:MP3/WMAWork Temperature:-18°C ...