For sale is a Verizon Wireless MX200 Plantronics Universal 3.5mm Flex Grip Headset new in the package.
The package says they fit a 2.5mm or 3.5 mm audio port. One review on Amazon said that the earpiece is 3,5 mm and it comes with the 2.5mm adapter.
This is a corded, not a wireless unit. Reviews can be read of this product on Amazon to learn more about it.
The model number is MX200CAET35.
There is a date of 2011 on the packaging.
The package has not been opened. The package does have minor wear to it.