The portable amplifier system SOUND-MASTER is a mobile power control unit, which can be used for demonstration purposes, sport performances, advertising events, and exhibitions etc. The advantages of this device will soon become essential for a successful event. The SOUND MASTER stands for professional acoustic irradiation, being very easy to handle. Depending on the locality, this apparatus is able to provide for up to 400 people with acoustic irradiation. Due to the mains- & battery powered combination technology, this device is able to function completely independently of a mains supply. The battery operating time is (3-5 hours) depending upon the equipment.The ability to choose between 4 audio modules and 16 Frequencies. Radio technology increases the flexibility of the SOUND MASTER and therefore the possibility in creating the adequate apparatus. Please regard that a maximum of 2 discs can be selected per SM-100.