Headset - mini stereo - Bose QC25

If alkaline battery used, 35 hrs of operation. When indicator flashes, 7 hrs time remaining. Usable even if battery runs out; Microphone and switch for calls built in cord; Around-ear, acoustic noise cancelling headset. Designed for noise reduction. Folds flat in case by rotating the earcups inward; First priority will be Music Department students using headsets with the Marantz audio CD players installed in carrels of Media Lab area. Use F Mini - M Phone stereo adaptor to plug the headset into the Marantz CD player