2.5 mm Headset, Noise Cancel Microphone, Shock Protection Swiveling Speaker Don't Compare This Professional Headset with General Headsets. All Day Wearing Comfort, Compete with Plantronics and Jabra GN netcom High-Grade Headsets for Call Center, Telemarketing, Customer Representative. 60 Day Money Back Guarantee, Multi Year Warranty, 20 Year Proven Quality in The World. Quick Disconnect headset(Cord length 3ft) + 2.5 mm to QD cord (stretched lenght is 6ft ) fit to a Phone's 2.5mm Headset Jack, NOT a Computer/Smartphone (3.5mm). Quick Disconnect is an Essential feature for Professional headset. It allows you to walk away without remove the headset. Noise cancelling Mic with Static shock protection : reduce background noise Super sound feature delivers richer and crispy communication Swiveling receiver with the large ear cushion supports excellent sound deliver.