In the first experiments the Fernauslöser worked flawlessly. Unfortunately, the release head hung sometime into the device. Repair attempts did not help. The release button tapered to a thin Plastikpinn who then operated the actual trigger switch. This Plastikpinn was canceled after a few long-distance trips and beyond repair. Too bad that one in an otherwise perfect it has installed equipment this breaking point. A slightly different design of the control knob, a little more plastic in the right place and you would have a real quality product. The Matrialmehrkosten for this improvement would perhaps amount to a fraction of a cent .... so thin the line between one and five stars !!!