Television provides a means for reaching a great number of people in a short period of time. Small businesses will typically use either spot television or cable television. A spot television ad is placed on one station in one market. The number of target audience who see your ad depends upon how many viewers are tuned into the television station at a specific time. Cable advertising is placed either on a local cable television channel or on a cable network. The number of people reached by cable advertising depends upon the cable penetration and cable channel/program viewership in a given market. Beyond television's reach, an additional advantage is its ability to convey your message with sight, sound and motion. The disadvantages of television advertising are: relatively higher cost - both the terms of airtime and production, limited length of exposure, short airtime (making it difficult to present a complex or detailed message) and the clutter of many other ads. Television ads may require multiple exposures to achieve message retention and consumer action. Also, many commercials are considered intrusive, prompting viewers to switch channels to avoid them.