This is a 3M Privacy Filter, model PF240W9EM (MPN: ‎98-0443-0049-3; ASIN: B0B8QT2B1D), designed for use with 24-inch full-screen monitors that have a 16:9 aspect ratio. The filter provides effective "black out" privacy from side views when viewed from outside the 60-degree viewing angle. It features the 3M COMPLY Magnetic Attach system, which uses ultra-strong magnets that allow the filter to quick-click securely into place for privacy or be easily removed for screen sharing. This black filter is also reversible, offering a choice between a glossy side and a glare-reducing matte surface that helps reduce fingerprints. The product's specific dimensions are 21.26 inches in width, 11.93 inches in height, and 1.3 inches in depth, and the item itself weighs 8.4 ounces. This unit is in open box, like-new condition, as noted in the condition description.