Dell Full-Size Wireless Mouse MS300, COLOR: Black, CONNECTIVITY: Wireless - 2.4GHz, SENSOR: Optical LED: SCROLL: Mechanical, RESOLUTION (DPI): Adjustable via Dell Peripheral Manager - 1000, 1600, 2400, 4000, BUTTONS: 3 (Middle click is programmable), PACKAGE CONTENT: Mouse, USB Receiver, Batteries (1 x AA), Documentation, DIMENSIONS: Height: 38.8 mm, Length: 115.32 mm, Width: 61.96 mm, WEIGHT: 65 g, 3y warranty