The package presents two similar, but not identical, sounding vocals. In the announcement on the official VOCALOID Facebook page, it was stated that anon represents "dere" (sweet) and kanon represents "tsun" (prim). The two traits spell out "Tsundere" when put together.
The packaged version of these voicebanks include over 200 uncompressed .wav files with phrases such as "Clap your hands", "Yo!", and "Hoooooo!!".
Vocal traits as noted:
Their ranges overlap each other and have similar tones, resulting in the vocals being relatively good for harmonization.
Though they have a 20BPM difference between each other, both share a 80 BPM tempo range, meaning that they can both can handle the majority of the same genres. However, the slight difference means a few genres can be handled better by one girl than the other.
Their vocals fit in a wide range of genres but excel at Rock and Pop in particular.
Software issues as noted:
The tone of the two vocals are the same, so the versatility of the product is less than other duo Vocaloids.
Since they are separate characters and not the same one, they were not given the ability to XSY with each other in VOCALOID4, so importing them will not open this function for them. They share this issue with ZOLA PROJECT who also cannot XSY their 3 vocals.