Datavideo CKL-200 is a combination of a dual colour (Green & Blue) LED ring and a unique retro-reflective back drop cloth, which is embedded with tiny glass beads. The LED light ring is mounted on the lens of the camera and projects a highly directional green or blue light on the back drop cloth. Thanks to the embedded glass beads, light is then reflected back to the camera creating a perfect green or blue background, providing you with an excellent keying result with very little effort. The dual colour LED ring is particularly useful if your key is setup to green and someone turns up wearing green. With CKL-200 you can simply switch the LED colour to blue and continue keying The 2 x 1.25m (w) x 2.5m (h) retro-reflective back drop with Velcro on the left and right hand side allowing users to use either one cloth on its own, or join them together to form a single 2.5m x 2.5m background (approx).