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Description:Model:gf-838 Pro.Spc.:19.5*6.3*6.6cm(open dim) 10*6.3*6.6cm (fold-able dim) Function explanation: Power supply:battery(aaa 1.5v*4),dc 5v(usb cable for pc),or ac power adaptor cord(output 6v,300-800ma) Speaker unit:52mmx2w*2(4ohms) Output power:2w*2(1khz 10% thd) Erequency response:150hz-18khz N.W.Kg:0.26kg/pc ;9kg/ctn Ctn./size(cm): 49*49*37 Qty/ctn(pcs): 40pcs Remark:usb line