In my smartphone the phone jack was broken, leaving only was still listening to the left earphone. The installation was really simple. Normal screwdriver suffices screwed 10 screws, 2 cable disconnected, used the new unit, screwed -> done! The sound through the headphones is excellent again! The built-in speakers actually sound slightly different from the originals, but that's my opinion, could not care less, because it is just as loud and the ringtone I have not heard in a top quality. The sound quality is not bad at this, but he sounds at full volume somewhat distorted, the bass reproduction is a lot of solid than the original (for me a plus). Thank you for this cost version! Am completely satisfied