Front Panel And Rear Panel; Front Panel; Nvr41-4Ks2/Nvr41-P-4Ks2/Nvr41-8P-4Ks2/Nvr41-4Ks2/L/Nvr41-P-4Ks2/L/Nvr41-8P- 4Ks2/L/Nvr21-4Ks2/Nvr21-P-4Ks2/Nvr21-8P-4Ks2/Nvr21-S3/Nvr21-P-S3/Nvr21-8P; S3/Nvr41-Ei/Nvr41-P-Ei/Nvr41-8P-Ei Series - Dahua VR21-8P-4KS2 Series User Manual