During the sets, DJ`s use vinyl and CD-players. Vinyl DJ-players far superior in case of sound to their counterparts on the CD-quality sound, and has already become a kind of benchmark for DJ`s. Modern players based on the principle of converting electrical oscillations in the pickup signals which are then reproduced as the sound waves using the speaker. CD-players continue to hold the best-selling place in equipment on the market, due to their affordability. CD-drive - the most structurally complex and, consequently, the most expensive part of cd-player. USB Flash technology has long been recognized as the most promising and cost of all existing as well as the most comfortable and unpretentious, this modern CD players also feature USB input for use with bibleotek songs on removable media.