Dell W1668 F2854 Dell Black PS/2 2-Button Scroll Wheel Wired Mouse, Plug-n-Play NO SOFTWARE REQUIRED, Compatible Dell Part Number: G4220 Genuine Dell PS/2 Ball Mouse with Scroll Wheel and Cord PS/2 Connection 2-Button and Scroll Wheel Plug 'n Play Dell Part Numbers: F2854, W1668, G4220