... is also avialable. product feature Part number:SG-339 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource ... MMC/DC card,PC,MP3/MP4Power supply:DC 5v/Li battery,500MAH,4hours.function:music player/loudspeaker/FM radiocolor:silver, ... 70dbdemension:220(L)*70(W)*38mm(H)input voltage:DC5v charger/USB line,500HAM,5hoursbatteryExternalweight:271.6g process of manufacture our ...