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1 Market Estimates and Forecast by Type, 2018–202312. 2. 9. 2 Market Estimates and Forecast by Service, 2018–202312. 2. 9. 2 Smart Doorbell Camera Product Category, Application and Specification 3. 9. 3 Zmodo Smart Doorbell Camera Sales, Revenue, Price and Gross Margin2014 2019 3. 9. 4 Main Business Overview4 Smart Doorbell Camera Market Status and Outlook by Regions 4.