FireFly3 Features: Manually activated rescue strobe 360 high intensity Xenon strobe visible for up to 2 miles Large sliding switch allows for easy operation by gloved hands Newly-designed base platform allows unit to stand upright easily Conceived as state-of-the-art replacement for famous Firefly forerunners, 4F and 4G Designed as "electronic flare" to replace day/night pyrotechnic signal in aviation life rafts Stainless steel retainer securely attaches removable battery door to case Integral strapping slots provide a secure anchor point Ideal for life vests, safety harnesses, backpacks and flight suits. Common Specifications for FireFly3 Size: 4.75 x 2.2 x 1.2 in (12.1 x 5.6 x 3.0 cm ) Weight: 3.8 oz (105 g) with Lithium batteries Material: Polycarbonate Waterproof: Factory tested to 10 m (33 ft) Beam Angle: Omni-directional 360 Visibility: Visible up to 2 mi (5 km) Flash Rate: 60 10 flashes per minute Lamp: High intensity Xenon strobe Battery Type: 2 "AA" alkaline or 1.5V lithium (5 year replacement life) not included Certification: USCG 161.012/58/0 (alkaline or lithium) USCG SOLAS 161.112/58/0; MO LSA Code Res. MSC. 81(70); FAA (TSO-C85) approved (with lithium dated batteries only) Limited Warranty: 1 year Operational Life: Minimum 8 hours continuous @ -1C meets USCG and IMO (SOLAS) specifications.