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The Poly APV-66 is an Electronic Hook Switch (EHS) cable designed for seamless compatibility between specific Poly wireless headsets and Avaya desk phones. With the APV-66, you can conveniently answer and end calls, adjust volume, and mute the microphone directly from your headset, without the need to manually lift the handset or use a separate lifter device. The EHS cable ensures a secure and reliable communication link between your Poly headset and Avaya desk phone, while maintaining high audio quality for clear and professional conversations. The APV-66 is easy to install and works with a range of Poly wireless headset models, providing a streamlined and efficient call management solution for improved productivity in professional environments.