The Koss GMR-545-AIR Open-Back & GMR-540-ISO Closed-Back Communication Headsets feature an ultra-lightweight design with an all-new custom fitting sling allowing either Headset to be worn for hours of extended use. Whether you're working at your home office, video conferencing, taking phone calls, listening to your favorite music or gaming, the Koss GMR Communication Headsets come loaded with features including a detachable boom microphone, available USB Connection (or standard separate 3.5mm audio/voice plugs) as well as the Koss Limited Lifetime Warranty. 
