Free shipping...The product is a 2-way A/b  manual rotary knob data transfer switch for bnc. Connection It allows users to easily switch between 2 different bnc  sources, such as a computer and a television, with a simple rotation of the knob. The brand , indicating its specific focus on video graphics array technology. This switch is ideal for enterprise networking and server environments where multiple devices require access to a single display or projector.