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The perfect entry-level model head lamp, the Ledlenser SEO3 in green and has an ideal price to performance ratio. The SEO3 runs on regular AAA batteries and on the lowest setting the light can last up to 40 hours. You focus it with a rotary switch and it is overall very easy to use. It also sits lightly and comfortably on your head. What's more, the headband can be removed and washed.