Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Brand new and high quality. Passive, no required. Prevents video-signal distortion caused by video ground loops. Eliminates tearing, talk and rolling. Prevents 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 Transient Voltage Suppressors: 12 Vrms Dimensions: 68 x 28 x 21mm with 24cm Colour: black Material: plastic + metal Package Contents: 1 * BNC Video Ground Loop Isolator Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.