Sold as 1 Each. SUPPORTS: Supports a single monitor up to 40' and 17.6 lbs., perfect for home, office, or gaming setups. FULL MOTION: Full motion adjustability with 360° rotation and +/-45° tilt, plus integrated cable management, keeps your workspace tidy and optimized. GAS SPRING TECHNOLOGY: Fully independent adjustable arms with gas spring technology offer 19.75' reach for increased workspace flexibility and ergonomic comfort. WARRANTY: Extended 5 Year Limited Warranty. EASY INSTALLATION: Quick-Fit VESA plate ensures easy installation on tables or desks using either a clamp or grommet. USB PORTS: Integrated USB ports at the base provide convenient charging for your devices while you work.