COMPATIBILITY AND WARRANTY: We promise 60-DAY MONEY BACK AND 2-YEAR WARRNATY. Please check in for compatibility guide of this customer service headset. If you don't see your phone model listed or come to any issue with our phone headphone, please contact us freely. We will reply asap within 24hours. GREAT DURABILITY: Wired telephone headset with light weight and strong design, stainless steel headband, superior quality speaker and microphone, reliable plastic parts. Reinforced cord built with Kevlar to withstand demanding environment and protect against office chair wheels, sharp objects for daily heavy use. Compete with Plantronic and Jabra expensive for great value. SUPER COMFOT HEADSET: Call center headset with super soft protein leatherette ear cushion,user-friendly hygiene, adjustable headband ensure fit for different head sizes. Ear cover is 180 rotatable, no pain no push to ears for all day long wearing. Binaural RJ9 phone jack headset with noise canceling microphone boom 330 degree rotatable for wearing mic on either side, a super communication headset for telemarketing and offices. HIGH QUALITY SOUND: RJ9 headset with noise cancelling microphone and HD audio sound ensure easy and clear communication for call centers, offices and home phones even in noisy environment. Communication headset with wideband audio solution offers natural and clear hearing. Anti acoustic shock for hearing protection. ONE PHONE HEADSET FOR MULTIPLE DEVICES: MAIRDI office headset comes with RJ9 and 3.5mm connectors for both landline desk phones, cell phones and PC laptops. It is a corded headset with 3.5mm jack for iPhone Samsung PC laptop, also a landline deskphone headset with RJ9 plug, works for Cisco IP Phone 7931G 7940 7940G 7941 7942 7942G 7945 7945G 7960 7960G 7961 7961G 7962 7962G 7965 7965G 7970 7970G 7971 7971G 7975 7975G 6921 6941 6945 6961 7821 7841 7861 8811 8841 8961 and more.