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Description:Model: GF-858D Pro.Spc.: 18*12*30cm Function explanation Input sensitivity:500mV Output Power:2W*2 8(OHM) Speaker:50*2,4(OHM) 3W Function: Vol+ Vol- Control, Power, SwitchAA Size Battery (not included) System Response:60Hz -18KHz +/- 3dB For all iPod and mobile socket N.W.kg: 0.93kg/pc ; 18kg/ctn Ctn./Size(cm): 66*61*31 Qty/Ctn(pcs): 20pcs Remark: USB line/audio-line