Hamilton Jackbox Listening Centers everything you need for classroom audio with up to 6 students at a time - Just add an audio source! LCP/JBP-6SV/HA5 Listening Center Includes: (1) Eight Position Jackbox with Individual Volume Controls (6) Hamilton SC-7V Deluxe Over-Ear Headsets with Volume Control lockquotegt; lockquotegt; The Hamilton SC7V Headphone with individual volume control and 3.5mm stereo plug. New soft leatherette style washable, replaceable ear cushions, new easier-to-wear lighter design with swivel ear-cups and 6 ft braided nylon cord all contribute to longer fatigue-free use. Now in easy to mark medium gray colors. Specifications: lockquotegt; Volume control Impedance: 170 ohms Speaker drivers: 57mm cobalt magnet type Headphone frequency response: 18-20k Hz 6 ft, Braided Nylon lockquotegt; lockquotegt; lockquotegt; Plastic Carrying Case One Year Warranty lt;iframe width="560" height="315" src="//www.youtube.com/embed/RhtAFnjsR6Q?rel=0" frameborder="0" allowfullscreengt;lt;/iframegt; lt;iframe width="560" height="315" src="//www.youtube.com/embed/lnGT2juv2Q0?rel=0" frameborder="0" allowfullscreengt;lt;/iframegt;