Recently (16 April, 2008) I got myself a set of new wireless keyboard and mouse from Microsoft.
The model was Microsoft Wireless Optical Desktop 1000. I got it from Low Yat’s Thunder Match store for RM 75.00.
There is another store who is selling around RM 95.00, talk about good bargain!
Anyway, the box says the battery life can last about 6 months. Being a heavy user, I’m will track how long it would last. 
Cheers!
[Updates]
May 23, 2008 - Using the provided Energizer batteries, no problems so far.
Jul 09, 2008 – My wireless mouse battery just got weakened, resulting no connection to my notebook. [ 3 months ]
[tags]wireless keyboard, wireless mouse, microsoft wireless optical desktop 1000, malaysia[/tags]
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stm · April 16, 2009 at 11:53 am
hi
i just want to ask about the wireless keyboard.does it function well?have any problem?and the price is just around RM75+- ah?
bcoz I’m interesting to buy a wireless keyboard too..hope 2 see ur reply ^^
p/s:can u reply to my email? thx thx