The CA-Bs clamp adapter connects the CL Companion binoculars with the VPA 2. With the included insert rings, the clamp adapter can be adjusted to perfectly fit the respective size of the CL Companion binoculars. Suitable for the VPA 2 variable phone adapter. Please refer to the "VPA 2 Overview" table under Downloads to find out which CA clamp adapter fits your binoculars or spotting scope.