17in TFT LCD screen features no radiation, low power consumption, high definition widescreen image. 2Outdoor machine has automatic opening and closing infrared night vision function. 3Toughened plexiglass touch button with blue backlight completely waterproof outdoor machine, extend the service life. 4Ultra-thin indoor machine design, tempered plexiglass panel touch button, with blue backlight and operation with key tone. 5With speakerphone function, electronic lock opening function and outside monitoring function.