Every Public Address audio system includes such element as volume control. These devices are designed to set the level of background music or voice messages. The equipment can be built into the room’s wall or mounted on the rack. The devices connect to 100 volt lines, where the total power of the speaker does not exceed 20 watts. Volume control equipment, produced by Apart, works with no faults, as well as other devices by this manufacturer. The noise level at any public place, whether it's a supermarket, cafe or bar, varies during the day. To create a comfortable atmosphere and good mood the music shouldn’ t sound very loud or be completely muted with extraneous noise. There are eleven steps at the device to control the volume and choose the necessary level of sound transmission. It is easy to build the device into a wall or on it with a mounting box. Mounting boxes are available, they can be found in DIY stores. The settings of the equipment allow triggering the alarm in case of an emergency, even if the device is set in the “off” position.