The NOVATECH ST-400A is a self-contained submersible xenon flasher designed to assist in the location and recovery of underwater oceanographic equipment.

It may be submerged for long periods in ocean depths to 7300 meters (24,000 feet). The activation of the ST-400A is completely automatic; when submerged below 10 meters, it is OFF, and at the surface it is ON at night only.

At the surface the ST-400A “double burst” flashes for approximately seven days at night only, and its visual range is up to three nautical miles at factory settings.