Yongnuo Flash and Trigger
I did some product shots of radio triggers for a blog article I've been meaning to write. This is Yongnuo's YN560-TX and the YN560-IV flash.
Lit by one YN560-IV to the right, grid-spotted on the background, plus another one in a shoot-through umbrella to camera left lighting the subject. Both flashes on optical triggering since my triggers were in the frame, and an SB-25 on-camera at 1/64 just to trigger the other flashes.