... device with 3.5mm 4.In stock Portable Sound Cylinder Speaker Instructions:1, battery: internal lithium ... digital display4, support TF card USB MP3 player5, OFF/ON: switch on OFF sound off, put ON plays ... perfect combination of classic and modern, best sound.2, a new micro-aluminum diaphragm speakers, ... CD, PSP, mobile phone, laptop, USB drive, SD card, GPS.4, metal casing, more noble fashion, different, ...