Specification* Emitter: 1x XHP360/500W LED with a lifespan of 50,000 hours* Operating voltage: 3.0V 4.2V* Driver: Constant current buck driver* Battery options: 1x 26500 rechargeable lithium-ion battery* Dimension: 154mm (length) 38mm (head diameter)* Weight: 167 grams (without battery)* Flashlight body: Aerospace grade 6061 grade aluminum alloy, CNC manufactured to hard-anodized to military grade specification type III, anti-abrasive finish to get solid built body, anti-crash geometry and better heat exchange.* Toughened mineral glass lens*Charging mode: 5V-2A Type-C charging interface*Lighting mode: high brightness - low brightness - SOS*Double click the switch: turn on the fast flashing mode*Long press the switch: switch to the stepless dimming mode, flash once from the brightest to the darkest - flash once from the darkest to the brightest*Quick closing function: any lighting mode stays for more than 8 seconds and can be closed by pressing the switch once* Water resistance i.a.w. IPX-68 ( Not for diving)* Reverse polarity protection from improper battery installation*Power indicator: 4 power indicators to keep track of the remaining power* Low voltage protection: The flashlight steps down automatically when the voltage is lower than 3.0V. It also turns off automatically if the voltage gets too low. Please recharge the battery.