and high qualityPassive, no power required.Prevents video-signal distortion caused by video ground loops.Eliminates picture tearing, talk and rolling.Prevents power cables laid by others interfering with the CCTV system.Insertion Loss: 0.5dBFrequency Response: 20Hz -10MHz (0¡«3dB)Coaxial Input/Output Resistance: 75 OhmGround Isolation : more than the 90dB more than the 50HzIsolation Voltage: DC 600V (Min)Insulation Resistance : 100M OhmTransient Voltage Suppressors: 12 VrmsDimensions: 68 x 28 x 21mm with 24cmcolor:blackMaterial: Plastic, MetalPackage included:6 x BNC Video Ground Loop Isolator6 x English Installation instructions.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.