Dahua VTH1660CH - Product Overview; Product Functions

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1.2.7 VTH2421FB/VTH2421FS/VTH2421FB-P/VTH2421FW-P
VTH2421FB/VTH2421FS/VTH2421FB-P/VTH2421FW-P Figure 1-10
1.2.8 VTH5441G
VTH5441G Figure 1-11