The M12 Vista Universal Amplifier connects
Plantronics headsets to just about any modular single or multi-line phone and
offer ergonomically designed volume, headset/handset, and mute controls.
Connects Plantronics headsets to most single or multi-line telephones.
Product Features
Receive and transmit volume control
Headset/Handset selector
Connects to most single or multi-line phones | 
