The AOI UIS-P1 is a new underwater strobe that has a guide number of 22 and is designed for mid-range photographers. It is made from durable materials and includes features like an LCD display, manual control, and a unique InTeLi mode for accurate TTL flash compatibility. The strobe is compatible with both OM System and Sony cameras, offering advanced modes like i-Macro and HSS. Priced at $900, it also comes with accessories like a diffuser and optional reflector and reducer rings for enhanced lighting performance underwater.