First of all, for the money provides a tremendous incredible things, even wireless TTL works. In the wireless application but would it be better to leave well. Because it turned out that removal of the flash of the camera was impossible. Here the Chinese design of manufacturing tolerances had slammed mercilessly and the safety pin which ensures the locking between flash and hot shoe, is not driven by upward when loosening the fixing screw. There remained only the very fiddly disassemble the flash (the screws are virtually impossible to achieve with mounted camera) to disconnect it from the camera. An operation that can not be expected each and also in an expensive repair in a specialist could have ended. Both manufacturers and retailers have not responded to my call for help in writing, which is an extremely poor performance of so fatal error result.