Halcyon E/O cords are versatile, underwater pluggable connectors and are standard equipment on the Apollo line of underwater film and video lighting; they are also available as an upgrade on all Explorer lighting systems. Slender two-pin connectors allow the user to disconnect the camera, housing, and light heads from our waist-mounted, high-capacity NiMH battery pack.

This often-overlooked feature is highly prized by underwater filmmakers returning to the stern ladder in heavy seas, clamoring up the steep sides of a sinkhole, or seeking to switch between video and conventional light heads. E/O cords also allow divers to carry a back-up light head and switch while underwater.