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3 Market Estimates and Forecast by Power Source, 2018–202312. 4. 9. 4 Market Estimates and Forecast by Connectivity, 2018–202312. 4. 9. 4 Main Business Overview4 Smart Doorbell Camera Market Status and Outlook by Regions 4. 1 Global Market Status and Outlook by Regions 4. 1. 1 Global Smart Doorbell Camera Market Size and CAGR by Regions 4. 1.