HP RB129AA#ABA Optical USB Mobile Mouse Optical USB Mobile Mouse 1000dpi Optical Sensor / Optical Sensor for Smooth and Accurate Cursor Movement USB Connectivity for Easy Plug and Play / Ambidextrous to Fit all Hands 4 Programmable Buttons to Manipulate All Your Tasks: Web Browser, Magnifier, Calculator and Many More Tilt Wheel for Four Way Scrolling: Up/Down plus Side to Side