Leviton Structured Media Center Ivory Digital Audio Volume Control Module Kit 48211-IVK No direct speaker/amplifier connections required at the volume control wall unit. DC Power Supply Included. Digital, transformer-free design uses aerospace-grade Cermetile resistors for proper heat dissipation and superior performance Selectable boot-up feature allows automated volume level control upon powering of the stereo system Microprocessor controlled relays for silent switching Tap mute feature activated when pressing center of rocker switch