... is economical, , samll-sized of matrix switcher System for CCTV surveillance systems. LH60- 30v matrix is economical, , samll-sized of matrix ... or operate the matrix switcher's menu and system setting, video and audio switcher, front equipment, set and disarm the system3 ... or operate the matrix switcher's menu and system setting, video and audio switcher, front equipment, set and disarm the system4 ...