Description of playing range of the instrument, and indications of the best way to notate the parts (i.e. in treble clef or bass clef, etc), and if it's best to switch clefs or use ledger lines. Also, a description of the high, middle and low ranges of the instrument and their respective timbres.
PHOTOS: A picture of the staff, with notes showing the range.
AUDIO: Sounds of the instrument played through its range.