The active noise cancellation module of the K391NC is compact, so these headphones will work great if you want active noise cancellation while walking.
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Pro Compact noise cancelling module
You aren’t likely to have issues using these on the go. Most active noise cancelling in-ear headphones have large control modules, while the K391NC has a fairly compact and light module. You can easily use these headphones while walking and comfortably enjoy active noise cancelling with your music.
Pro Fairly detailed and rich sound
The highs are quite detailed, yet do not get harsh. The mids are slightly forward, so vocals and instruments can easily be heard. The bass is not very powerful but is tight, so you’ll get decent punch from your music.
Pro Decent active noise cancelling
A good amount of noise will be blocked from mixing in with your music. Loud, low-pitched sounds may still be clearly heard though
Pro Integrated microphone
You can take calls with these headphones on. A microphone is integrated into the remote which makes answering calls fast and convenient.
Pro The headphone cable can be detached from the control module
You can easily replace the 3.5mm cable should it get damaged. You can detach the 3.5mm cable from the control module which is very convenient. Other noise cancelling modules have fixed cables, so you’ll have to replace the headphones should the cable get damaged.
Pro Good accessory bundle
The accessories included are all very useful. You get two 3.5mm headphone cables, a USB charging cable, silicone ear tips, a travel pouch and an airplane adapter.
Con Limited inline controls
The inline remote only allows you to play, pause, and skip tracks. You can’t control volume levels though.