The remote release is very well made, the packaging is very high. Despite that the trigger did not fit on my camera, I would still write a good review. As I said, I could not use the remote control to my DSLR, I tried then to another camera, where they worked very well. Due to the non Passends I contacted the seller and my request was immediately dealt with.
Note, however, that the trigger not to cameras such as the EOS 550D and the EOS 600D, as specified fits. On the packaging there is a sticker that says: 'RS-80N3 for Canon D60 / 5D / D50 / 40D / 30D / 20D / 10D'. Accordingly, the connection is no 2.5mm jack, but rather an 'indefinable' connector.