The basic units keep track of contacts and appointments, but there are thousands of software applications that can be added. Some models even have wireless capability to check e-mail and stock prices. A speaker designed to produce extremely low bass sounds. They're common in home theaters and car stereos. Yes, it's what you hear when that Honda Civic beside you at the stoplight makes your car rattle.
Active subwoofers have their own amplifier.
Passive subwoofers do not. No film is involved. Images can be transferred electronically to a computer for manipulation, emailing or Web site creation. All major camera companies make digital cameras now. The ability of a new component to play older media.