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The Smith & Wesson USB Rechargeable Flashlight, XML-U2 LED Flashlight has 3 modes, high, low, and strobe. The barrel measures 1.1 inches around, and it operates on one 18650 lithium battery. A handy holster with lanyard helps you to use hands free when necessary. A USB cable, and wall adapter are included. You can also use with 2 CR123 lithium batteries (not included).