These are warm sounding headphones which make them great for all-around music listening. There is no in-line mic or remote though, so you cannot take calls or do remote smartphone/player functions with these.
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Pro Lightweight and comfortable to wear
Despite being made out of metal, these in-ears are still fairly lightweight, so wearing them for long periods shouldn't be a problem. The included ear tips are also quite soft, providing good cushioning and seal.
Pro Warm sounding with forward mids, smooth highs and deep bass
The highs of these headphones are not too sparkly or airy, yet still has good detail. This results in a smoother sound. Mids are forward and clear, while the bass has good depth without creeping up on the mids.
Overall, these headphones are quite fun to listen to and can work with pop, rock, hip-hop and even metal. These are not the best though if you tend to listen to music with a lot of detail and intricate parts like jazz or classical as these do not offer a high level of detail reproduction.
Pro Durable and tangle-resistant cables
The M2's cable is braided and covered with a sleeving material, making it significantly more durable than other cables. It also makes it extra resistant to tangling.
Pro Solid build quality
The ear pieces are made out of metal and have great fit and finish. Not only does this make them look great, but also gives them a premium feel.
Pro Includes plenty of accessories
With the M2, you get 2 types of ear tips with three sizes each, a shirt clip to prevent the cable from moving around when worn and ear cable guides to help keep the headphones in place.
Con Highs may be lacking for some
The audio lacks sparkle in the higher frequency range, which may be disappointing for those looking for lots of detail reproduction in that range.
Con No in-line microphone
Not really a con, as headphones are primarily for listening to music. However, this can be inconvenient when used with a smartphone and you have to take calls.