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. Monaural 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 telephone headset includes RJ9 jack and 3.5mm jack, allowing one office headset for multiple devices. With quick disconnet plug, you can switch between landline deskphones, cell phone, PC laptop and more. Please check in or contact us freely for compatibility guide of this wired headset.