To adjust the music broadcasting and alarm system in shops, supermarkets and malls are used control elements. The control elements are volume control and various types of selectors. The volume control is used to set the level of the sound of music or voice message of a music broadcasting system. Apart Company, a manufacturer of high technology systems for the professional music broadcasting, presents a number of models of volume control. There are two models of the devices – the Euro series and multi-channel models. The first is designed for a 19 inch rack-mount and the latter to mount on the wall. The devices of Euro series, in turn, are divided into stereo regulators and models for 100 V lines. The volume level can be changed both in the same zone and in several zones at once. The majority of models of Apart volume control has eleven graduations. This gradation allows one to select the most suitable for the time of the day and the overall level of noise in the room volume level. Regardless of the volume level in the case of the emergency the alarm will sound with the necessary loudness.