iKey DT-TB Stainless Steel Optical Trackball, PS/2 Model

iKey stainless steel optical 38-mm trackball is completely sealed in a waterproof enclosure,  designed to meet NEMA 4X protection, in polycarbonate housing with a stainless steel case. PS/2 model. MPN: PM-TB PS/2

Possible replacement for Kontron SMP2000 Sealed Mouse Pad (ICS Advent).