Police Security's Twin Power flashlight is a groundbreaking, patented, ultra-bright 2000 Lumens flashlight that redefines traditional dual power flashlights. Unlike dual power, which requires two separate battery cartridges, the Twin Power flashlight operates seamlessly with a single cartridge. The cartridge holds a built-in 21700 rechargeable battery for primary power and three AA alkaline batteries for backup. with this innovative design, you'll never face the dilemma of drained power. Simply toggle between alkaline and rechargeable battery sources with the touch of a button, ensuring uninterrupted illumination whenever you need it. Equipped with battery level indicators, this flashlight assures you'll never be left in the dark.