Sennheiser cx275S is a nice headphone by Sennheiser.
Sennheiser CX275s is a music inear headphones with a microphone.
The build quality is well and it can withstand a lot of shocks. It is very comfortable and with its different ear buds which comes with the package.
It also have a leather pouch in which you can put these headphones.
Now lets talk about the sound.
The sound is very impressive. It have a deep base and the treble is good. This headphone is best suited for bass and treble lovers. As I have Xiaomi mi3 and It plays decent. When I attached these headphones with I phone, The treble was good. Even you can change the bass and treble with various equaliser apps.
Microphone
Its microphone is very sensitive to sound. It can catch the sound even from distance and it is so clear that I record all the sound for my YouTube Videos from this.
Overall with Sennehisers 2 Year warranty this product is awesome and value for money.
You can buy it if you want an inear headphone with deep base and also with a microphone.
But this headphones sometimes doesnt support some cellphone models. And sennheiser had provided a connector for that too. So be sure to check the compatibility.