ATEN 4-Port USB HDMI Dual Display Secure KVM. Keyboard port type: USB, Mouse port type: USB, Video port type: HDMI. HD type: 4K Ultra HD, Maximum resolution: 3840 x 2160 pixels, Video bandwidth: 30 Hz. Product colour: Black, Housing material: Metal. Power source: AC, AC input voltage: 100 – 240 V, AC input frequency: 50/60 Hz. Sustainability certificates: RoHS