Strong SRT 41. HD type: 4K Ultra HD, Operating system installed: Android, Maximum video resolution: 3840 x 2160 pixels. Device interface: HDMI, HDMI connector type: Full-size, Wi-Fi standards: 802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac). Power source: AC adapter, AC adapter frequency: 50/60 Hz, AC adapter input voltage: 100 - 240 V. Product colour: Black. Internal storage capacity: 8 GB, Storage media: Flash