The highest video resolution supported by the Stylus Tough TG-820 is 1920 x 1080 pixels. That's over two times the video resolution of a 1280 x 720 pixels digital camera, which is the most frequently found video resolution supported by waterproof cameras that were released more than two years ago. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
This camera's video resolution (1920 x 1080 pixels) is in fact the best supported video resolution across all similar spec digital cameras that have been on the market for around the same time as the Stylus Tough TG-820.
A 320 x 240 pixels video resolutions is the worst supported video resolution across similar types of camera.