Had previously my Nikon D710 triggered a "Nikon ML-L3 Wireless Remote Control", which was enough for my needs perfectly (Self-Portrait or Night Scene). There was great disappointment when I realized that a Nikon D810 has no infrared sensor. An alternative was needed. And it is: + Works on a Nikon D810 + Works without direct visual contact with the camera + Easy to use + Uses standard AAA batteries (2 pcs. Per trigger, ie 4 batteries order separately) + Super low (27,37 Eur, Stand 11.28.2014) = Fortunately users