100% brand new and high quality Passive, no power required. Prevents video-signal distortion caused by video ground loops. Eliminates picture tearing, cross talk and rolling. Prevents power cables laid by others interfering with the CCTV system. Insertion Loss: 0.5dB Frequency Response: 20Hz -10MHz (0~3dB) Coaxial Input/Output Resistance: 75 Ohm Ground Isolation : more than the 90dB more than the 50Hz Isolation Voltage: DC 600V (Min) Insulation Resistance : 100M Ohm