Conductor 4 from Black Diamond Solutions is a BrightSign accessory designed specifically for merchandising applications that features both line level and headphone level output. It has 4 independent audio outputs and 2 audio inputs; button and rotary encoder inputs; and features customizable functionality. Pushbutton or proximity touch button control is also available as well as touch panel or rotary encoder control. Conductor 4 can also be integrated with a media player for content and volume control.