This little remote works great! Used with a EOS 7D and 50D with 2 YN-622c with a flash Yongnuo YN-565 and a flash Metz 48AF-1 no complaints. There is a interressante function that is not clearly indicated in the description, the YN622C-TX box allows controlling the outbreak of the case. A remote control that works at 100m by pressing the test button Yn-622c (the YN-622c-TX housing being linked him to the case with the cable provided)