The sub-categories listed below are rather self explanatory.
Sound cards,
video graphic cards,
speakers and
headphones are what they are. Nonetheless, certain sub-categories contain products that could have easily been placed in some other category. For example, within the sub-category,
ipod/mp3/audio players, there are mp3 players and accessories for ipods but also, wall mountable speaker selector switches or gadgets designed for switching among Cable TV, Satellite, Video Games and other home video products with coax cable, "RF" connections.
