Warranty&Hearing Protection: This wired desk phone headset with mic, the landline headphone can compete with Plantronics QD headsets for call centers and office. The Cisco phone headset with built-in hearing protection circuit to protect users against acoustic injury and sudden sound burst. And 2 Years Warranty/45 days money back is offered for each office phone headset. Pls feel free to contact with us for any questions about wired headphone for Cisco. GREAT DURABILITY: High-end materials and durable structure ensure the telephone headset to withstand the constant demands of all-day use in busy environments. The built-in reinforced quick disconnect cord will protect desk phone headphone against office chair wheels, sharp objects on daily use. Stainless steel headband, superior quality speaker and noise cancelling microphone, reliable plastic parts make this call center landline headset durable enough even for 24/7 busy environment. Luxurious Comfort: Call center &office lightweight over ear telephone headset, wired desk phone headset with noise cancelling mic is comfortable enough to wear for an extended period of time, no pressure on your head even for long time wearing. And adjustable headband fits for different head sizes and and flexible goose neck microphone boom offers accurate talking position. Phone headset two ears over the head headset keeps the noisy distractions from your attention. HD Sound Quality: The microphone phone headset is the over-the-head style telephone headset with mic for landline phones which is made for office workers, SOHO, work from home or call center agents. Wide band audio technology with communication speaker frequency enable phone headset delivering more richer and natural sound, plus ultra noise cancelling microphone to filter out background noise for clear 2-way communication.Professional call audio solution offers natural and clear hearing. Cisco IP Phone Headset: This telephone headset with noise canceling mic is only works on Cisco IP phones with RJ9 headset jack, such as 6921, 6941, 6945, 6961, 7821, 7841, 7861, 7931G, 7940, 7941G, 7942G, 7945G, 7960, 7961, 7961G, 7962G, 7965G, 7970, 7971, 7971G, 7975, 7975G etc. The office phone headset is workable on other brand phones by the RJ9 adaptors. Both landline phone headset and RJ9 adapters are with Plantronics compatible QD(Quick Disconnect).