Professional Ergo Pro Convertible Headset and Amplifier (Over-the-Ear, Over-the-Head) Professional Ergo Pro Convertible Headset and Amplifier (Over-the-Ear, Over-the-Head) • Includes a noise canceling microphone • Compatible with Fellowes or Plantronics® M12 type amplifier • OSHA compliant • Includes Quick Disconnect For light-duty telephone use, 1-3 daily hours. One-year manufacturer’s warranty. L300 Series Monaural $199.95 retail $188.99 each -- you save $10.96 (5%) 
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