... 3.OEM&ODM support 4.Matrix switcher There are types of Matrix switcher with different features, How to choose a suitable Matrix switcher ... hot backup mainframe option design7.Video/audio switch card, alarm input card, follow control card ... Audio Output Signal: Input FollowerVideo S/N: >70.5 dB, Audio S/N: >58 dBThe Video Input Isolates: >55 dB, The Video Output Isolates: >50 dBThe Audio Frequency Input ...