ULTRA DURABLE AND 2 YEAR WARRANTY: The solid construction and cord ensure this office phone headphone more durable and better avoid damaging during the use. The telephone headsets come with 45 days return for replacement or full refund and 2 year warranty. DON'T BUY IT FOR COMPUTERS AND CELL PHONES. EASY AND CONVENIENT TO USE: Directly connect the phone headset with your cordless DECT phones or desk phones, no additional amplifiers or adapters required. 2.5mm hands free telephone headsets with cord clip included contains volume and mute control onto the cord, which is customized for Call Center Service, Conference Calls, Telemarketing, Home and Office. MOST COMFORTABLE PHONE HEADSET: The mono hands free business telephone headset with adjustable headband allow fitting all head size suitably and firmly wearing on. The soft leatherette ear-pad and lightweight design improve all-day wearing comfort. DESIGN FOR CLEAR CHAT: 330° adjustable, flexible microphone phone headset support to wear on either the left or right side and pick up your clear loud voice terrifically. Built in noise cancelling mic works fairly well to reduce background noise and provide crystal clear sound on both ends. Acoustic shock protection circuit protects your hearing carefully. 2.5MM TELEPHONE HEADSET: WIDE COMPATIBLE WITH Panasonic AT&T Vtech RCA Uniden Cisco Linksys SPA Grandstream Gigaset Zultys Technologies most cordless DECT phones and landline phones with 2.5mm headphone Jack. For compatibility list in detail, please refer to description below. NOTE: THIS PHONE HEADSET DOES NOT APPLICABLE TO MOBILE PHONES AND COMPUTERS.