The HAPPRUN 510G delivers native 1080p resolution with support for 4K playback, producing vivid and reasonably sharp images enhanced by HDR 10+ and a 20,000:1 contrast ratio. With a brightness rating of 400 ANSI lumens, it performs best in dim or dark environments, though some loss in clarity is noticeable in well-lit rooms. 

Edge sharpness can be inconsistent, particularly at wider throw distances, but central image quality remains clear.

A standout feature is its official Google TV system, allowing access to apps such as Netflix and Prime Video without needing a streaming stick. The included Google Voice Assistant streamlines navigation, and compatibility with Google Cast and AirPlay enhances flexibility across devices.

Audio is driven by a 5W built-in speaker with Dolby support, offering clear output for small rooms. For a more immersive experience, external audio via Bluetooth 5.2 or the 3.5mm jack is recommended.

Setup is aided by 6D keystone correction and manual focus, though fine-tuning can be fiddly, especially with corner alignment. 

With dimensions of 9.5 x 8.3 x 3.8 inches and weighing 2kg, it's both portable and easy to store, ideal for mobile use and smaller living spaces.