About this itemPrecisely right: With its 1600 DPI optical sensor, this mouse works on almost any surface with astounding accuracy. Stash it in your bag with your laptop and you'll be good to go. No strings attached: Roam free from wires or clutter with a 2.4 GHz wireless connection via simple dongle.Note : 3 years manufacturer warranty will be honored by HP on the device from the date of purchase. Physical box says 1 yearColour: Black Connectivity Technology: USB Special Feature: Wireless, Ergonomic Design Movement Detection Technology: Optical