The Sea-Safe Firefly Plus Strobe Light is dual-featured and incredibly compact, this powerful strobe and flashlight combo is the perfect emergency signaling device for recreational boaters. At only 5 oz (142g), it can even fit in a diver’s bc pocket. The signal is visible for up to 1 m (1. 6 km), and the strobe functions for 10 hours of continuous operation (2 hours in incandescent mode).FeaturesHeavy-duty impact-resistant dome and flashlight coverEasily connects to backpacks and life vests with webbing attachmentsWaterproof to 328 ft (100 m)Floats if dropped overboardKrypton bulb provides 3600 omni-directional beamSpecificationsDimensions: 5.3″ x 1.5″ (135 x 38 mm)Type of bulb: xenon flash tube with krypton bulbBurn time on high: 2 hoursBurn time on flash mode: 10 hoursType of battery: 2 x AA alkalineWeight (with batteries): 5 oz (142 g)Batteries included: noIncludes: Wrist strap