2-YEAR WARRANTY: 45 DAYS MONEY-BACK GUARANTEE & 24 MONTHS WARRANTY BY ARAMA. Ideal for customer centers, call centers, telephone counseling, conference calls, online courses, hospitals, banks, business, school, insurance, office and home. Compete with Plantronics or Jabra heavy duty Phone Headsets. ALL-DAY WEARING COMFORT: Ultra lightweight office telephone RJ headset with adjustable headband to fit all head sizes, soft foam ear cushions reduce pressure on ears and head. All-new design makes it durable in call-intensive environments, reducing dropped calls and freezes, keeping pace with the demands of your busy day. NOISE-CANCELING MICROPHONE: Superior noise-canceling microphone performance minimizes background noise and distractions for a high-quality calling experience. 330°rotatable microphone can be twisted to better pick up your voice, guaranteeing easy and clear communication even in noisy environments. HD SOUND WITH HEARING PROTECTION: Phone headset features wideband audio technology to enable richer, clearer calls and reduces hearing fatigue. Acoustic shock protection circuit filters out sounds above 118 dB, protecting you from high-frequency noise. ONLY COMPATIBLE WITH CISCO IP PHONE MODELS:?NOT for Cell Phones and Computers?This RJ9 telephone headsets ONLY compatible with Cisco IP phone models : Cisco IP 6821, 6841, 6851, 6871, 6945, 7821, 7841, 7861, 8811, 8841, 8845, 8851, 8851NR, 8865NR, 7942G, 7945G, 7962G, 7965G, 7975G, 8941, 8945, 8961, 9951, 9971. NOT compatible with Cisco Spa phone series.