Door Station/Video Parameters Camera 1/4″ CMOS Resolution 720 × 576 Video Frame Rate PAL: 25 fps Door Station/Audio Parameters Audio Input Built-in Omnidirectional Microphone Audio Output Built-in Loudspeaker Audio Quality Noise Suppression and Echo Cancellation Door Station/Device Interfaces Four-Wire Interface 1 Four-Wire Interface (1-ch Video Input, 1-ch Audio Input/Output, 1-ch Power Supply, 1-ch Grounding) IO Output 1 Relay Output Door Station/General Material Aluminum Alloy Power Consumption Max. 3W Working Temperature -30° C to +60° C (-22° F to 140° F) Working Humidity 10% to 90% Dimension (L X W X H) 128 mm × 42 mm × 24.8 mm (5.0″ × 1.7″ × 0.9″) Indoor Station/Display Parameters Display Screen 7-Inch Colorful TFT LCD Display Resolution 800 × 480 Operation Method Physical Button Indoor Station/Audio Parameters Audio Input Built-in Omnidirectional Microphone Audio Output Built-in Loudspeaker Audio Quality Noise Suppression and Echo Cancellation Indoor Station/Device Interfaces Four-Wire Interface 4 Four-Wire Interfaces 1-ch Video Input, 1-ch Audio Input/Output, 1-ch Power Supply, 1-ch Grounding Indoor Station/General Power Supply 12 VDC Power Consumption ≤5 W Working Temperature -10° C to + 55° C (14° F to 131° F) Working Humidity 10% to 90% Dimension (L X W X H) 195.8 mm × 132.8 mm × 18.39 mm (7.7″ × 5.2″ ×0.7″)