This listing is for an unused, in original box, Astra 3D face scanning/recognition camera by Orbbec.

From the manufacturer's website:

Astra 3D cameras provide computer vision that enables dozens of functions such as face recognition, gesture recognition, human body tracking, three-dimensional measurement, environment perception, and three-dimensional map reconstruction. 

The difference is that Astra is optimized for long-range use cases, which makes it great for interactive systems, entertainment, retail, and robotics. Astra was developed to be highly compatible with existing OpenNI applications making both the Astra and Astra S ideal cameras for pre-existing apps that were built with OpenNI.