This durable, waterproof, 944-lumen LED flashlight features three output colors (white, red, and green) and uses one rechargeable 18650 battery or two non-rechargeable CR123 batteries for power. It has a rotating ring on the handle to switch between output colors and offers a built-in micro-USB port for charging the included rechargeable 18650 battery internally. It is compact enough to fit most backpacks or pockets and will not add much weight. It also offer a carbon-steel belt clip for wearing on your waist. For lasting battery life and proper illumination, this product has four light modes (low, medium, high, strobe) and five interchangeable mode activation sequences. Use the tailcap dual push-button switch for activating, deactivating, and configuring this flashlight as needed, and monitor the built-in LED battery status indicator to measure your usage.