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This flashlight has dual super bright white LEDs that may never need replacing and provide over 100 hours of battery burn time. Light turns on when the head is flipped up. It also pivots to a full 180 for aiming light where you need it. The built-in clip attaches to surfaces up to 1/2" thick. Powered by 2 CR2032 3V Lithium coin cells batteries (included).Battery burn time: 100 hrs.Length 3.5 in.Wt. 1 oz.