"The Nitecore Multi-Task Hybrid MH2A Rechargeable LED Flashlight features three normal outputs from 22 to 233 lumens, with a 600-lumen turbo mode. An intelligent two-stage pushbutton switch allows you to program your desired output, including a disorientating strobe or SOS emergency signal. To activate the 600-lumen turbo mode, turn the rotary switch on the head. This gives you access to your preferred operating output, while allowing you to quickly change to turbo mode. Built for daily use, the aluminum housing has a scratch and corrosion-resistant hard-anodized finish, is submersible to 6.6' and impact-resistant to 5'. A micro-USB charging cable and a 14500 li-ion rechargeable battery are included, but the light's circuitry allows it to also run on other rechargeable battery chemistries and disposable batteries. An integrated charging port allows the battery to charge in the light.|High efficiency regulation circuit|Intelligent charging circuit with voltage detection charges safely and rapidly|Integrated micro USB charging port is water, dust and impact resistant|Multiple output modes are conveniently accessed via rapid rotary switch|User-defined mode provides customized brightness levels plus strobe and SOS modes|Intelligent memory function stores preferred brightness setting|Broad voltage circuit accepts both rechargeable and non-rechargeable Lithium batteries|Optimized ultra-precise reflector offers a longer beam distance than competing products|Toughened ultra-clear mineral glass with anti-reflective coating|Reverse polarity protection|Detachable two-way anti-rolling clip|Anti-rolling design"