The dot com is the behemoth of the bunch placing second out of nearly 4.5 million results for “Voice Recognition” in the Google serps behind only Nuance (formerly ScanSoft makers of Dragon Naturally Speaking) and with its age of 9 years it’s not very likely to lose much position any time soon.
There would be too many factors for me to place a value on these because they’re all developed and established sites with the youngest being 7 years old. Much of the value may depend on the marketplace for the phrase “Voice Recognition”, if this were the year 2000 I might say you could place many zeros at the end of the price but today I’m not so sure. Anyway, these are obviously very valuable domains.