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1. Handset Port 
2. Port to handset or headset port  
3. USB connector port for power 
4. Receive (speaker) volume 
5. Microphone mute button 
6. Supervisor port 
7. Headset port 
8. Headset compatibility switch 
9. Microphone transmit volume 
10. Telephone compatibility 
11. Handset or Headset use 

Product overview: 

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