Check the listing for details. Plantronics M12 Vista Universal Telephone Headset Amplifier. Condition: Open box. Listed at 69.99 USD. This auction Is for a Plantronics M12 Vista Universal Telephone Headset Amplifier. Features: The M12 connects your Plantronics headsets to most single- or multi-line telephones to improve voice quality and maintain sound at a comfortable level.One-Button selection between headset and handset. The outside packing box shows signs of handling, but inside all is fine.Free Shipping only applies to the Continental United States. Alaska and Hawaii please e-mail for a quote. All other countries please e-mail for a quote. We ship UPS and we combine shipping to save you Money. Please check our Ebay for other great bargains... Be sure to add me to your favorites list! Check out my other items! Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.