LH60- 2020R matrix is economical, , samll-sized of matrix switcher System for CCTV surveillance systems. LH60- 2020R matrix is economical, ... , samll-sized of matrix switcher System for CCTV surveillance systems. The LH60-2020 system is ... to control or operate the matrix switcher's menu and system setting, video and audio switcher, front equipment, set and disarm ...