It works. But not all the time and not from very far away. Works best from within one foot away from my camera. I used it to get into the picture, but my arm was extended, point at my camera. It would not work from inside my light weight windbreaker pocket. The pre-flash signal when the camera fires. Wished it worked at distances of 25' and from a pocket. But for the price, it will work most of the time for slow shutter speeds.
Small, easy to use. Fast service from Crutchfield.
Does not always work, must be close to camera, and can not be used if covered by a pocket for concealment.