Veeki Zoomable Scalable LED Flashlight Cree-xml T6 Waterproof Flashlight 900 Lumen Cree XML T6 Tactical Torch Glim Lantern with 18650 2800 Mah 3.7v Rechargeable Battery and 18650 Channel 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 (Included)