Specification: msn: htx8888x@ hotmail.com skype: huatengxing tel: + 0086-755-61333838 url: http: / / www.htxhk.com http: / / www.htx.en.alibaba.com Speaker: diameter 40mm Sensitivity: 108dB S.P.L at 1KHz Impedance: 32 Frequency Response: 20Hz~ 20, 000Hz Rated Power: 15mW Cable length: 2.5m 0.3m Microphone Unit: 6x5mm-58dB 3dB Plug Type: Diameter3.5mm stereo