The StarTech 215M9-PRIVACY-SCREEN is a magnetic privacy protection filter designed for 21.5" screens (16:9). It utilizes Microlouver technology to conceal the display from viewing angles outside the center (±30° / 60° viewing cone). The filter attaches with a magnetic system for easy installation and removal without tools, while optional adhesive tabs are included for extra support and flipping access. The surface is fingerprint, scratch, and dust resistant. The active area dimensions are approximately 19.13" W x 10.70" H (48.6 cm x 27.2 cm) with a thickness of about 19.69 mil (~0.50 mm).