Phonetics and Phonology
In contrast to Oirat, it has /o/ and /u/ and a diphthongized equivalent of *ai. However, monophthongized reflexes of *ai can be encountered and more so in older language material, so it can be assumed that *ai > ɛː > ɛe due to Khalkha influence. Somewhat similar developments can be observed for other vowels, but as at least /n/ and /l/ can get palatalized, it is problematic whether palatalized consonants or fronted vowels have to be considered as phonemes. It patterns with the Oirat dialects of the Mongolian state in that it retains *ŋn and sometimes has *b > /m/. It doesn't have the Khalkh /ʊ/ and /u/ in non-first syllables, as these merged with /ɔ/ and /o/.
Read more about this topic: Darkhad Dialect