To me, channel is the proper term. Many recorder manufactures like to use channel to refer to INPUT, but this clearly has two internal microphones and two xlr inputs and the possibility for playback/overdubbing/multiTRACK on the channels.
The site also indicates the internal mics have independent control, that's pretty nice but not sure how useful. Also, like most other small recorders, has a built in speaker almost guaranteed to be useless.
the internal rechargeable battery is not a good thing.