mini digital speaker 1,Support T-Flash card,support MP3 format music 2,canbe connected to mobile phones and audio devices ... MP3 format music2,canbe connected to mobile phones,computers and other external audio devices MP3 players3,built-in 200MA lithium polymer battery, ... can be charged with USB 4,Frequency range:600-12000MHZ5,speaker: 4Ω 1 ...