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With a main one watt LED and two smaller side facing LEDs the Mars 4.0 is one of the best sealed rear lights. A tool-free removable rear plate covers the batteries, but beyond the battery plate everything is sealed. The power button is part of the secondary seal behind the internal battery tray. A lifetime warranty and excellent performance are matched by a run time of over 150 hours, and there’s an array of top quality tool-free mounting options. "Well-sealed, easy to use & highly visible. Highly recommended."
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