Speaker Dimension:40mm lmpedance:32ohm Sensitiviy :105dB S.P.L at 1KHz Frequency Response:20Hz~20,000Hz Rated power:15mW Power capability:150mW Cable Length:1.8m+/-0.3m Plug Type:3.5mm Stereo Microphone Unit:6*5mm-58dB+/-3dB QTY/CTN:20 PCS N.W. :5.5 KGS G.W.:6.5 KGS CTN SIZE:45*44*43CM