Title: dedicated keyboard buttont don't work
Product review: i have the tk-423k and the basic keyboard & mouse function ok but many dedicated buttons on the keyboard are rendered useless. volume up/down, calculator, mute and many others on my ms comfort 5000 keybd/mouse combo don't work. caps lock use to pop up when they were on. this no longer works either. i'm sure i'll find more as i use it and probably end up throwing it out. bummer!
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