B50 Wireless 2.4GHz No Handheld One to Four more video doorphone

Model:B50; Screen Size:No; What's in the box:1Outdoor Unit,English and Chinese Manual,USB Charger; Screen Resolution:1080p; Sensor Size:1/4 Inch Color CMOS Sensor; Connection:Wireless 2.4GHz; Sensor Type:CMOS; IR Distance:5; Installation:Surface Mounted,Wall Mounted,Wall,Wall Mounting; Kit Configuration:One to Four more video doorphone; Viewing Angle:170; Answering mode:Handheld; Working Temperature(°C):0-50℃,0-50℃; Material:Plastic,Plastic,Aluminum Alloy,Aluminum Alloy; Listing Date:05/16/2019; Production mode:Self-produce