... TEL-4C-3aThe typical model appliesvideo , control, power ; three-in-oneOperation voltageVideo 8V, Control12V, Power 15~270VNormal discharging current ( ... installation:1, This product is in series installed on power cable, signal line and video line of the camera, the output ... . When it needs installation please according diagram to install. One of power supply line, “L ~” is firewire or positive. “N ~” ...