Anirudha,
Back in 2008, 2009 I see someone using Infibeam's PI which is also a e-reader like kindle. That device have a 3.5 port which let you put your headphone jack and let you play the songs.Later amazon come to picture. In 2014 with my curiosity I bought a kindle 4th gen. The device is still with me and working fine. Later I have 2nd gen and 3rd gen.If you are developer, avid book reader, It's a good device. You can read a lot of things without the eye-strain. The good thing about Kindle 4 is it's not touch device which I believe make it more durable than paperwhite .Everything will be going good until ...