This is a rebranded version of the Folomov 18650S. Glad to see that they went with a NW tint. My 18650S has a WW emitter. Which, at least on my copy, the 219D was more of an ugly street light orange than a pleasing soft white. As far as the tail switch, I believe that the driver is actually in the tail. Thus, eliminating the need for a signal tube or wire. Review - Folomov 18650s