Best Sound Noise Cancel Monaural Headset + 2.5 mm Headset Quick Disconnet Adapater, Compatible with Plantronics QD for Desk Phone DON'T COMPARE this Professional Headset with General Headsets. Compete with Plantronics and Jabra GN netcom High-Grade Headsets for Call Center, Telemarketing, Customer Representative. Multi Year Warranty, 20 Year Proven Quality in The World. WORKS with a 2.5mm headset jack (Pin Shaped Female Jack) like Item Photos. CAN'T CONNECT to RJ9 (Cube-Shaped Female Jack), NOT Computer/Smartphone. COMPARE to Plantronics H series Headset + Plantronics 2.5mm Headset cord QUICK DISCONNECT HEADSET (Cord length 3ft, No Volume Control) + 2.5mm Headset Adapter (Stretched lenght is over 9 ft). QUICK DISCONNECT is an Essential feature for Professional headset for Business. It allows you to walk away without remove the headset from your head. NOISE CANCELLING MICROPHONE with Static shock protection reduce background Noise by up to 75% (No headset can be 100%). Great Sound feature Monaural Headset delivers richer and crispy communication. Swiveling receiver with the large ear cushion supports excellent sound deliver.