The controller attaches to the hot shoe of the casing and LCD display allows easy adjustment of three Speedlight groups without moving.
No coupling problem or adjustment is immediate and without special handling. Everything works perfectly with Nikon iTTL flash or compatible.
The manual seal is only broken English and "ideograms" in a language unknown to me (Chinese, Japanese, Korean?). Fortunately, the various controls are relatively simple to understand, and the LCD helps fine. It could - almost - to do without instructions.