Good non HSS flash manual. Recommended as a remote flash.

Good powerful and easy to use flash (for who ever used a flash cobra). Configurable at will (Sleep time, auto power off, etc ...). Buttons a little "cheap" compared to the Nikon product but at that price, we will not make it difficult.
It lacks synchronization beyond 1/320 (for security, down to 1/250 min.). It does not take orders from HSS (high speed sync).
Responds reasonably well in slave mode with remote control via the main flash. I used two of these flashes controlled by my Nikon SB910.
Responds perfectly controlled radio (but only in manual mode as of course the brand has a contactor).
The document is "folk" as English comes out of a well known online translator whose Chinese is not the language of choice. With some trial and error, we understand the Chinese way of thinking expressed in "English".