Sold as 1 Each. Particularly ergonomic form in a 45° design. Meets or exceeds FCC standard. Precise sensor with 3-level, adjustable resolution. Six-button design for speed and enhanced functionality. Status LED indicates low battery charge. Signal lets you control your cursor from up to 33' away. NVIDIA Quadro P600 Up to 4 GB discrete graphic card provides excellent ability in a variety of multimedia applications and user experiences. 3-year manufacturer limited warranty.