VK2-1080VRD(IR)3V9(F) manual V1.0
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4. Appendix ....................................................................................................... 74
4.1 Troubleshooting ......................................................................................74
4.2 Alarm Connection ...................................................................................75
4.3 Preventive Maintenance .........................................................................75
4.4 Product Specification .............................................................................76
4.5 System Requirement for Web Browser .................................................77