Stereo multimedia dual headset delivers music quality fidelity - also excellent for Internet telephone calls, instant messaging voice calls, etc. Foam ear pads allow some outside sound to enter so that you will be able to hear a telephone and other office sounds. Comfortable fit permits long hours of use. Supplied with two plugs, one for the microphone and the other for the earphones. Standard 42 inch length cables on both units. Earpiece impedance 32 ohms, microphones are a standard high impedance for use with computer sound cards. TS544