SURFACE OBSERVATION SIGNAL Designed to operate as an integrated part of your buoyancy compensator, the Surface Observation Signal (SOS) significantly increases your surface visibility in case of separation from your boat or your buddy. World-renowned underwater photographer Stephen Frink conceived and patented this device to assist during his working dives when his hands are full of expensive camera gear. Now you can have the same protection with this Aqua Lung/Sea Quest engineered exclusive product! ·          Attaches directly to the right rear buoyancy compensator relief valve opening ·          Easily inflates using standard buoyancy compensator pneumatics ·          Diver-controlled "rip cord" deploys the signal device without further handling ·          Fully inflated the device extends well-above the water surface for increased surface visibility of the diver ·          Easily rolls back into integrated holster for streamlined storage and simple reuse ·          The S.O.S. will fit Aqua Lung, SeaQuest and most Technisub BC's.