That it is a purely manual einzustellendes device should be clear who buys the flash that goes also clear from the data given out (I've heard from people who showed disappointed about the fact that the flash does not properly working with their Canon or Nikon - this you just have to invest in a corresponding expensive equipment).
The function of the built-in radio trigger, I can not verify or assess, since I already have a Hähnel Funkauslöser have, although it operates at the same frequency, but is not compatible with the integrated receiver of the Yongnuo. Tripping over the Hähnel receiver works flawlessly.
The included English description has worked a bit poor at first glance, after re exact and complete reading but I have found that everything is Necessary included and described. I've seen other products with much more rudimentary descriptions.
Something pathetic is the supplied stand. The hot shoe and the incorporated threads of plastic acting not very reassuring, something metal would have me dear, but for the price you can not probably expect.
Provided the service life of the flash does not run shortly after the warranty period from (as unfortunately in many electronic devices are today and what is not can not yet assess natürlcih today), I see no reason to give away weninge as 5 star it.
For everyone who wants to flash manually, I can only recommend the device.