Why not ask here?
http://forum.lowyat.net/topic/1643148

this I quoted from my own review from another thread

i tot gt built-in mic??

Been using a42ja for almost a month. Here's my short review.

Good:
- great gaming performance. play any game in medium high setting smoothly. (including GTA4 and Crysis)
- good price
- ok design. It looks better in real life compared to what you see in picture. Very business-like notebook.
- great keyboard. I like the layout and design.
- heat drop fast to idle temperature after exit gaming.

Bad:
- very soft speaker. Some might claim the sound is soft but the sound quality is good. Well, its doesn't matter.
- only 1 mic or audio jack
- no dedicated volume up down button. ( I hate the Fn combo thing to change volume)

Hrmp:
- The screen quality is mediocre (worst than dell screen but better than acer)
- heat dispenser is at the left side. Alot of wind and heat generate from it when gaming. Kinda feel like the hand dryer in public toilet.
- 5730 heat is significant lower than i7-740m heat by 10-15 celcius be it when idle or gaming.
- The heat is usually between 70-80 celcuis while gaming. I didn't use any notebook cooler.The max heat i encountered so far is 91 celcuis for i7-740m and 80 celcuis for ati 5730.

Verdict:
A very good buy for a 14inch gaming laptop. Another viable alternative right now is xps 15 or xps 16. I didn't choose Dell because the delivery time is too long, and 15inch is not so portable. However Xps series is a premium entertainment notebook while Asus A series is more ergonomics. Choose what is suitable for you.