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Why Choose Us Buyer Reviews Product parameters display size 21.5 inch Backlight type D-LED resolution 1920×1080 brightness 500 cd/m2(optional) Viewing angle 178° (vertical, horizontal.) Android RAM 2G(optional) ROM 16G(optional) Support system Android 11.0(optional) interface Wi-Fi, DC, USB, LAN, Audio, TF Windows (need to contact customer service) RAM 4G(optional) ROM 128G(optional) Support system i3/i5/i7 (optional) interface Power, Microphone, Audio, LAN,, HD Multimedia