• Plantronics Vista M22 universal modular adapter
• Replacement for the PL-M12
• Enhanced features over the M12
• Modular jack plugs into phone
• For use with any Plantronic quick disconnect headset
• Operates on 2 AA batteries (included) or AC adapter (not included)
• Manual scroll volume control
• Headset on/off switch (switches between headset and telephone handset)
• Mute button
• ClearLine Audio technology
• Wide band audio (totally compatible with existing systems and "wide band ready" to deliver superior audio on integrated wide band (VoIP) systems)
• Protection from loud noises (delivers greater protection against sudden loud noises by quickly reducing them to comfortable levels)
• Phone line noise reduction (filters incoming and outgoing phone line noises, such as high-frequency hissing, making conversations clear, less fatiguing and more comfortable)
• Call volume equalizer (equalizes the level of all calls to the same comfortable, user-preferred listening level)
• Echo management (eliminates echo problems introduced by latency in IP networks; so even if your new IP phones do not require an Amp your conversations may still benefit from the use of one)
• Black