And high qualityPassive, no power supply required. Prevents video signal distortion caused by video grounding. Eliminates tearing, talking and rolling. Prevents power cables from being laid by others interfering with the CCTV system. Insertion Loss: 0.5dB Frequency Response: 20Hz -10MHz (0-3dB) Coaxial Input/Output Resistance: 75 ohms Ground Isolation: more than 90dB more than 50Hz Isolation: DC 600V (Min) Insulation Resistance: 100M ohm Transient Attenuators: 12 vrms Dimensions: 68x28x21mm with 24cm Color: Black Material: Plastic, Metal Package Contents: 1 x BNC Video Ground Loop Insulator 1 x English Installation ManualOnly the above package content, other products are not included. Note: The light and different displays may cause the item's color a little different from the real thing. The measurement error is +/- 1-3cm.