This Listing is for ONE (1) Dell 6 Button Laser Mouse with adjustable DPI It is a 6 Button w/ Scroll Wheel and Laser Tracking Left Overs After Upgrades It is part# 4K93W M-UAV-DEL8 Tested Working Check Out My Other Listings For Possible Need / Want Versatile mouse with fast, accurate response The Dell 6-Button Laser USB Mouse is a versatile mouse for use in almost every type of computing. Its features six buttons and fast, accurate motion response to provide more control than a conventional mouse, and it connects to your computer via a USB cable. Laser navigation for improved control This mouse is designed with the Avago Laser Stream Navigation Sensor, which features 1600 dpi movement resolution for detailed, accurate motion response.