ACR FireFly PRO SOLAS - Using wide light emission LED's, the Firefly PRO strobes cuts through the foulest conditions creating a super-bright flash visible for over 3 miles. With 3 activation functions, select between the 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 cool white color of the LED strobe has no yellow tint allowing the light to be seen at greater distances. With the microprocessor and energy efficient electronics, the Firefly PRO operates continuously for over 56 hours, that's 48 hours longer than SOLAS/USCG regulations and twice as long as similar looking competitors.