Yongnuo Speedlite YN565EXII Flash gun for Canon EOS, GN58 YN565 EXII, YN565EX II
(It is fully powered and fully featured. Although Yongnuo released YN568EX II model, YN565EX II still remains one of most popular flashes though. c) It can only receive wireless signal from Nikon system, avoiding Canon System.