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Description:Model: GF-841 Pro.Spc.: 20*7*3.2cm Function explanation output power:0.9W * 2 Power supply frequency:50/60HZ The power enlarger Input sensitivity:> 83 Dbas Intelligent degree:470MV The circuit importation resistance:10 K Erequency response:160-20K HZ Speaker:1 1/2"(the outside path 40 mms), 8 N.W.kg:0.45kg/pc; 18kg/ctn Ctn./Size(cm): 65*50*30 Qty/Ctn(pcs): 40pcs Remark: usb line/audio-line