The K 490 NC is a pair of on-ear, noise cancelling headphones. These are very comfortable despite being on ear, and these can collapse to a compact size, making them quite portable.
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Pro You can use active noise cancelling on its own
This doesn't need to be connected to an audio source for active noise cancelling to function. You can turn the feature on by itself and block ambient noise and enjoy improved silence.
Pro These have a snug fit
These headphones stay on very well, and can be worn while moving around or going to the gym.
You don't have to swap out AAA batteries to power these headphones. This model has an internal battery and can be recharged via USB.
Con Poor build quality
These headphones feel quite flimsy, and some users have snapped the earpieces off the headband.