1 YEAR WARRANTY: We offer 30 days money back & 12-month worry-free guarantee. This RJ9 landline phone headset for cisco phone is perfect for Call Center Service, Telephone Counseling Services, Phone sales, Insurance, Hospitals, Banks etc. Business, Office and Home. ULTRA COMFORTABLE: Super lightweight landline phone headset with adjustable headband to fit all head sizes, soft leatherette ear cushion enhances all-day wearing comfort. Easy to set up, direct connect the headset to your phone, no additional amplifiers or adapters required. CRYSTAL CLEAR CHAT: Corded Binaural office phone headset with flexible adjustable Noise Cancelling Microphone to reduce background noise. Acoustic Shock Protection Circuit to protect your hearing. Less noise, Clearer voice. PHONE COMPATIBILITY GUIDANCE: If your phone model is not in the description list, kindly contact us for compatibility checking before purchg. IT IS ONLY COMPATIBLE WITH SOME SPECIFIC CISCO PHONE MODELS LISTED IN DESCRIPTION. For other models, pls contact us for Compatibility Guide or Advice. CISCO COMPATIBILITY:?NOT for Cell Phones and Computers?This office telephone headset is compatible with Cisco office phones 7841 7945 7821 7965 7861 7811 7942 7960 7962 7841 7940 7961 8841 8811 8845 8851 8865 6941 6945 Plantronics M12 M22. SEE MORE COMPATIBLE PHONE LIST IN DESCRIPTION.