This is the latest version with the button on the side. Good build quality and the trigger is measurable (half-press / press). For the quality of transmission, nothing to do with my old 433MHz trigger that was sometimes misfire, there ca through the walls of the apartment. I tested all the different flash modes, everything works well and simply. So no problem including reflex trigger function with the cable supplied. config: Nikon D90 and two flash units YN465 and YN560 AAA battery so no battery exotic provide thereafter. Content of purchase and very good price / quality I think.