... are with mic & volume control, suitable for PC, MP3, MP4, DVD. Specification as follow:1.Speaker: Φ40 mm. 2.Sensitivity: 105dB ... Ω 4.Frequency response: 20Hz-20,000Hz5.Rated power: 100mW 6.Mic. Unit: 6*5mm dia. Electric condenser.7.Mic. Sensitivity: -58dB±2dB ... sets HEADPHONE SET W/MIC & VOLUME CONTROL for computer, MP3, DVD,...