The Firefly PRO Waterbug is a SOLAS approved strobe light with a built-in water activation feature that will automatically activate once submerged. With 4 activation functions, toggle between the armed mode for automatic water activation, ultra-bright strobe light or the SOS strobe to visually alert Search and Rescue of your location and toggle to the Steady-On feature for close up recovery operations. The remarkable LED's produce 360 beam of light that is over 30 Candelas bright allowing for visibility of over 3. 5 miles. With the updated microprocessor and redesigned electronics, the Firefly PRO Waterbug will operate continuously for over 56 hours, that's 48 hours longer than SOLAS regulations and twice as long as competitors.