unfortunately does not work with any equipment together

The idea to get an optically triggered flash trigger for low-cost expansion of the setups for off-camera flash for little money, is absolutely impressive. Unfortunately, there are a few fly in the ointment.
On the one hand the mounting shoe is made with a lot of air, or as Cybertine put it: It is shaking! Lightning without locking screw, depending on the situation, falling down from the mount to a tripod Somikon trigger.
What the only unique the flash fires, as described by M. Kainz, Subject: I have to find 565EX II and the Yongnuo YN. The Sigma EF-500 DG ST is, however not triggered. But you can not blame the well Somikon trigger, because the same complaint about this lightning I have already read elsewhere in other remote release.
In any case proved to the dealer (Pearl) to be very fast and obliging partner in the complaint. In this respect, a purchase is risk free, even if you - like me - obviously has the wrong equipment.