There are 3 cables: one powerlink (looks like proprietary), one video (one connector is some form of DVI) and one USB (standard).
Length of cables that I received was around 5 meters. You can probably get longer if needed, just let them know how far you intend to install BS5 and BM5 from each other.
If you want to mount the BS5 on the wall, with cables hidden in the wall, you will need a fairly thick tube in your wall. Internal diameter of the tube is 20mm. You need that width to be able to pull the connectors of the three cables through it.