This small footprint projector weighs only 8.82 pounds each, but it is bright enough for contractor installation. Projector is increasingly used in more media-rich presentations. It becomes a truly multi-media device. The PLC-XC50 has a 7-watt speaker, loud enough for an average classroom or business meeting room. This eliminates the need for a separate external speaker. To aid the 7-watt speaker, closed captioning (NTSC) provides the audio portion of a television signal as printed words on the projected screen, which is helpful to hearing impaired students. The PLC-XC50 is the industry's first portable model that incorporates SANYO's exclusive Active Maintenance System (AMF). This filter system eliminates the necessity to manually change the filter frequently. It automatically senses when the airflow is obstructed by dust and advances the cartridge to new filter. Besides its built-in lens cover, it has a new projector design preventing excess dust from entering. Even lamp replacement is from the top of the cabinet, and you are able to change the lamp even while the projector is installed on the ceiling through an easy access panel. It�s easy to replace, with one-touch cartridge and side-loading access. A new security bar allows thick 0.4-inch security cables. The PLC-XC50 is not only more portable, but also more secure. This protects the media/AV facilities' investment. Only the administrator is allowed to operate on-board buttons and logo-control settings. An onboard pin number reader to lock the projector is used when the projector is not in use, allowing the unit to be left in one place, such as in a classroom, with peace-of-mind.