DESC: Professional Over-the-Ear Three-Way Telephone Headset for Heavy-Duty Use Noise canceling microphone (included) eliminates most background noise Quick Disconnect allows for ease of movement without removing headset Compatible with Fellowes or Plantronics M12 type amplifier Three over-the-ear wearing styles: QuickFit, SecureFit and FlexibleFit. For 8+ hours daily use. SVT Secure Voice Technology boom offers increased protection for sensitive information.