I could not test on its function the product, unfortunately. To other potential buyers to spare my experience here the information that the product does not fit into the standard holder of Sigma 1609 Twist Lock. There is a universal mount. In this the contacts are otherwise formed and I suspect that this Trittfrequenzsensorkit fits it. For the standard holder, it does not fit anyway. The term "suitable for BC1609" led me up the garden path, and I did not think that Sigma offers two different holders for a model. Addendum: return shipping and refund via Amazon has as always works perfectly.
