The Ele Rexso K is based on a Hi3559 Processor and 16MP Panasonic MN34210 sensor. The camera performs best in its native 4K 30FPS resolution, with 1080p and 2K modes not being as sharp as competitors. Audio is quiet. Video is pretty good at night with lots of detail, however there is a decent amount of noise introduced. The user interface can be somewhat confusing but it is straightforward enough once you figure it out.
The Ele Rexso Explorer Dual is a interpolated 4K action cam based on the Novatek NT96660 processor and an unknown image sensor (likely the Omnivision OV4689, since some spec sheets say “IMX179” but the IMX179 has not been combined with the NT96660 before. This is just a guess, however, so please don’t take it as truth). Externally the camera is near identical to the Firefly 7S, but the video results are quite different. I love this wine-red color it comes in too.