Logitech M221 Silent Wireless Mouse (Black).

Model: Logitech M221 Silent Connectivity: 2.4 GHz Wireless Wireless Range: Up to 10 m (33 ft) Sensor Type: Optical Resolution (DPI): 1000 DPI Buttons: 3 (Left, Right, Scroll Wheel/Middle Click) Scroll Wheel: Yes (Vertical) Battery: 1 × AA Alkaline Battery Battery Life: Up to 18 months Receiver: USB-A Nano Receiver Dimensions: 99 × 60 × 39 mm Weight: Approximately 75 g (with battery) Color: Black