Water activated version of the Firefly3.  Unit will turn on when armed and in contact with water.  USCG, USCG SOLAS, and FAA approved.

Batteries & Accessories:
#422-AA  Alkaline Batteries, AA
#428       Lithium Batteries, AA
#312       Sea Float
#316-1    Hook Patch, Set of 5
#316-3    Loop Patch, Set of 5