The NICOR RELS-R Series 4-inch Regressed LED Downlight features an inset baffle design and an ultra-thin profile under an inch deep. Its off-board driver includes a 5-position CCT selector switch (2700K–5000K) and delivers high-performance color quality (92 CRI, R9 = 54). Installed directly into drywall via spring-loaded tabs and the provided 4.25-inch template, it requires no recessed housing or separate junction box.