The cadets clock is a small alarm clock that is gifted to every cadet when they move in to a dorm. You can change the screen color after youve bought it using the left blue button. The factory setting is a soft blue. Cadets can write notes on the screen and set reminders by writing a time on the touch screen. It will automatically set a reminder and send it to the cadets phone when the time comes. The alarm can be a varity of songs, all the cadet has to do it search the song on voidvision (their version of youtube) and then sync it to the Cadet clock and press the right blue button to confirm it. This is an aufully handy item, although it can be annoying if one of your dorm mates chooses a song that no one particullarily likes. If you are wondering why it says "B.N" and not "A.M" that is because the time in the ship is slowed to allow more classes to commence. B.N means Before noon. A.N would mean after noon. There is also a setting on the cadet clock that brings more specific timing. Such as E.M (early morning) DA (Dawn) B.M ( bright morning) B.N (before noon) NO (noon) A.N (after noon) E.E (early evening) L.E (late evening.) DU (dusk) S.N (Soft night) L.N (Late night) and G.T.B (go to bed.)