COMPATIBILITY AND WARRANTY: We promise 60-DAY MONEY BACK AND 2-YEAR WARRNATY. Please check in for compatibility list(including but not limited). If you don't see your phone model listed or come to any issue with our headset, please contact us freely for compatibility guide and aftersale service. We will reply asap within 24hours. GREAT DURABILITY: 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 COMFOTABLE HEADSET: 2.5mm headset with super soft protein leatherette ear cushion,user-friendly hygiene, adjustable headband to fit for different head sizes, ear cover rotatable,no pain no push to ears for all day long wearing. Microphone arm 330 degree rotable for wearing mic on either side, super call center headset for telemarketing and offices. HIGH QUALITY SOUND: Phone 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. Wideband audio solution offers natural and clear hearing. Anti acoustic shock for hearing protection. ONE HEADSET FOR MULTIPLE DEVICES. This office headset comes with 2.5mm and 3.5mm connectors for both landline desk phones, cell phones and PC laptops. With 3.5mm connector for iPhone Samsung PC laptop and most other Androids. With 2.5mm connector works for Panasonic AT&T Vtech RCA for Cisco SPA Grandstream Zultys Gigaset for Polycom Uniden Cortelco Clarity for Yealink W52P Home Office IP and most Cordless Dect Phones with standard 2.5MM HEADSET JACK.