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 Compression Rate: | 64 Kbps 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 in 1 Four-Wire Interface) General Power Supply: | 12 VDC Power Consumption: | ≤5 W Working Temperature: | -10° C to + 55° C (14°