Most compelling reasons are, PS/2 more secure than USB, optical better than mechanical for tracking, easy use plus easy cleaning. Customers are migrating now making PS/2 the preferred standard over the 2 button scroll.

Specification

Product
Product id	188366
Brand	Hewlett Packard
Partnr	EY703AA
EAN/UPC code	882780517936
Mouse
Purpose	Office
Device interface	PS/2
Movement detection technology	Optical
Scroll type	Wheel
Buttons quantity	2
Scroll	Y
Movement resolution	400 DPI
Recommended usage	PC
Design
Product colour	Black
Country of origin	China
Ergonomics
Cable length	1.8 m
Power
Power source	Cable
Weight & dimensions
Weight	126 g
Other features
Mouse dimensions (WxDxH)	117 x 62.1 x 39.5 mm
Size (imperial)	4.61 "