Variable 49mm ND Filter ND Vario 2-400 MMX (49-5)

The (49-5) at the end of the product name is the product's internal reference number.

This is a variable ND filter that allows you to adjust the light reduction by rotating the frame.
The light reduction can be set steplessly from 1/2 to 1/400.

I forgot I had purchased it, and it has been used very little, so it is in near-unused condition.