This is a different faceplate for Notune21's design to add a led ring (50mm inner diam. / 60mm outer diam.) to the C270 while maintaining focus wheel.

You can buy the led ring from amazon, here : https://www.amazon.fr/gp/product/B00W6ZXQOO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

BEWARE ! These are quite powerful, so you need a pretty beefy PSU if you want to power it from the printer.