Indoor Station (DS-KH2220) Display parameters Display screen 7-Inch Colorful TFT LCD Display resolution 800 × 480 Operation method Physical Button Audio parameters Audio input Built-in Omnidirectional Microphone Audio output Built-in Loudspeaker Audio quality Noise Suppression and Echo Cancellation 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 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")