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Description:Model: GF-807 Pro.Spc.4.5*5.3*3.4cm Function explanation output:2W * 2 ( d 31mm ) Sensitivity: 82 ± 3db impedance:8 ± 15% Distortion:0.5% Lithium ion battery output:3.6V Lithium ion battery input:4.2V ± 0.05V Suitable ambient:-20+50 N.W.kg: 15kg/ctn Ctn./Size(cm): 79*50*31 Qty/Ctn(pcs): 80pcs Remark: usb line