What type of HDMI port does this laptop have, and does it support 4K output?

The laptop has an HDMI 1.4b port.

Does the HP 15 Laptop come with a backlit keyboard, and if so, can the brightness be adjusted?

The HP 15 Laptop does not come with a backlit keyboard.

Questions & Answers: HP 15 Laptop, 15.6" FHD (1920 x 1080) Display, Intel Core i5-1235U 10 Cores Processor, Intel Iris Xe Graphics, 16GB DDR4 1TB PCIe SSD, Bluetooth, HDMI, WiFi 5, Windows 11 Pro,Microsoft Office License

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HP 15 Laptop, 15.6" FHD (1920 x 1080) Display, Intel Core i5-1235U 10 Cores Processor, Intel Iris Xe Graphics, 16GB DDR4 1TB PCIe SSD, Bluetooth, HDMI, WiFi 5, Windows 11 Pro,Microsoft Office License

CPU : Intel Core i5-1235U (Base 3.3 GHz, up to 4.4 GHz, 8 MB L3 cache, 10 cores) Processor which delivers instant responsiveness and best-in-class connectivity.
Screen : 15.6" diagonal, FHD (1920 x 1080), IPS, micro-edge, anti-glare, for crystal-clear visuals and vibrant image quality.
Graphics : Intel Iris Xe Graphics gives you a new level of performance with crisp, stunning visuals.
Ports : 1 SuperSpeed USB Type-C, 2 SuperSpeed USB Type-A, 1 HDMI 1.4b, 1 AC smart pin, 1 headphone/microphone combo
Premium Features : Wi-Fi 5 and Bluetooth, 720p HD camera

$769^.00 –