... insertion loss. It adapts to overvoltage protection for security video signal, protecting the device from the damage ... static discharge. It’s widely used in security monitoring system, environment monitoring system.FeaturesStandard: GB/T18802.21-2004/IEC61643-21:2000 ... an extra 1channel backup, total 17channels)Applied devicesCCTV/CATV system, Antenna of Television, FM receivers, video camera, monitors ...