Here's what other sites are saying:
ACR Camp & Hike Firefly 3 Strobe Light mpn2140. Waterproof for up to 33 ft 0(10m). Runs continuously for 8 hrs on 2 AA batteries.
Offshore and backcountry rescue teams can't find you if they can't see you. Make sure you stay visible with the ACR FireFly 3 Strobe Light. This tough little strobe straps right onto your pack, PFD or harness, and flashes once every second with a high-intensity, 360-degree beam that's visible for up to two miles. The FireFly 3's polycarbonate body is waterproof to 33 feet (10m) and meets USCG and SOLAS standards for personal electronic flares.
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