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Smaller than other approved lights, the HemiLight™ɜ features rounded edges to maintain the integrity of inflatable life jackets. The high-intensity flashing LED light automatically activates for 20+ hours when it comes in contact with salt or fresh water, and can be deactivated simply by pushing the red button. Installation is quick and easy (the HemiLight™ 3 can be retrofitted to almost any style life jacket in a matter of seconds). Non-hazardous lithium battery, 5 year life (non-replaceable).