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Sades Company with its own industrial park and 250 R&D technicians for modeling, structure design, electronics, user interface, and software,has introduced lastest advanced modernization production assembly line ,ISO9001,ISO14001,CE,ROHS,SVHC,FCC,UL,FDA are certified. Features: Loudhailer diameter:40mm(NdFeB) Frequency range: :20-20.000Hz Sensitivity:113+/-3dB at 1kHz Impedance:32 Ohm at 1khz Max Input power:30mW (maximum) Mic Dimension:6.0*5.0mm Plug:3.5mm Mic Sensitivity:-54dB +/- 3 dB Magnet size:15.5 x 2.0mm Cable length:Approx.2.2m Distortion: smaller than 5% THD Package : 1 * SA810Headset 1 x cabel which is 2 to 1 1 x User Manual After-sale service:1.One month return and one year warranty service in Smart@Purchase Shop.2.Your most satisfaction,our all goal.Just contact us if you have any problem,we will be here with you in any time.