purchase to make eyes closed, a big plus compared to the old version with the on / off button on the side instead of top, it's beast but it avoids removing the flashes and return them for turn off and on, something else, be careful and between c3 c1 following the model of the device, which is different is the tip of the shutter cable connection (PC sync) that comes with, after several Test with a flash and my yn560lll 430 ex ll I am fully satisfied, you can put its remote flash anywhere without being bothered if it's going to go for tripped.