Highway Cree Xml-T6 1000 Lumen Bright LED Flashlight with Rechargeable Battery,AC Charger Reverse polarity protection: protect the LED light do not burn out if the battery installed backward Adjustable focus range for different usage, stretching to adjust its focus 5 switch modes: high / medium / low / strobe / SOS Skid-proof and water resistant design, best suitable for Outdoor Camping, Climbing, Cycling, etc Power Source: 1 x 3.7V 18650 Battery or 3x AAA battery (Not Included)