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Impulse is the ultimate personal multi-task light! Powered by 2 lithium coin cells, the Ultrabright LED burns up to 36 hours and has 3 modes: low, high and flash. With its quick release clip, hat clip, and a range of colors to choose from, you’ll want one for each of your keychains and backpacks! Impulse is UL® Class 1, Division 2 approved.