The polycarbonate is for antennas and signal strength. It has these beam form it has four beam forming antennas that will combine for a really great millimeter wave, five g signal. And the phone is connected bya h d m i, because there's an h d m i port on the phone,. Really, any camera with an h d mi port. So now you're using your a seven s three basely as a web cam, or whatever you want to do - alive streaming, or a live se on a camera intwitch i, or es stream, or like, just sending photos in this way....