These are pre-connected (daisy-chained) sets of Lumen Subsea Lights, making it easy to install two or four lights with a single penetrator to the watertight enclosure. All lights will respond to a single signal. See here for the individual Lumen Lights. SKU: BR-100717 HS Code: 9405.40.6000 Contents 1 x Lumen Subsea Light Set, pre-connected with 2 or 4 lights 4-8 x Stainless steel M3 mounting screws 1 x Nut for Pre-installed Cable Penetrator 1 x O-ring for Pre-installed Cable Penetrator