On The Way 900 Lumen Expedition Handheld Flashlight LED With Battery Charger, 18650 2800mAh Rechargeable Battery and Sleeve, AAA Battery Holder Reverse polarity protection: protect the LED light do not burn out if the battery installed wrong Adjustable focus range for different usage, stretching to adjust its focus Use one 18650 rechargeable Li-ion battery or 3 AAA batteries 5 switch modes: high / medium / low / strobe / SOS Skid-proof andwater resistant design, best suitable for Outdoor Camping, Climbing, Cycling, etc