Looking at their web site, I notice a few things. Namely, if you want any specifics, you need to "Inquire" by providing contact information so that their horde of sales representatives can contact you with the information you desire. But for the bit of information you can get without giving them contact information, I quote the following little gem from their web site involving modes of operation.
When very high rates of data encryption are necessary, key expansion can be used in which the QKD key material is expanded through a deterministic random bit generator (DRBG) algorithm to produce the one time pad key. This mode reduces the amount of QKD key material necessary for encryption, yet still provides exceptionally high data confidentiality.
I find it quite enlightening that they claim that using "Key expansion" that they create a "one time pad". That immediately raises all sorts of red flags since what's created isn't a "one time pad". And the fact that they obviously don't know the actual meaning of that phrase calls into question their competence about cryptography.