Your TV is more than a screen. Its USB ports will accommodate webcams, controllers, and other gadgets that add surprising, dynamic functionality.

The 3.5 mm headphone jack has been in decline for many years, but if your phone still has one, you can use it for a lot more than just listening to music.

Mounted snugly atop your monitor, this weird gadget lights up your workspace without shining directly into your eyes or onto the screen. Before you start fretting about the glare that it will throw on ...