Multimedia projection systems can be often pretty complex units as they consist of many components and accessories. A lot of these items will eventually need to be replaced. These may include items such as lenses, converters, batteries, remote controls, cables, lamps, memory cards, adaptors, power cords, interface cords and suspension mounts. You can also add accessories to your projector such as extended warranties, carrying cases, software, security locking systems, carrying handles, detachable speaker systems, and security cages. These items are available in various sizes, shapes and designs. They can range in price from just a few dollars for a battery or cable to a few hundred dollars for a speaker system or replacement lamp.