550 LUMENS/150 M BEAM DISTANCE/14 HR MAXIMUM RUNTIME Police Security’s Twin Power headlamp is an ultra-bright, 550 Lumen patent-pending headlamp that redefines traditional Dual Power functionality. Simply toggle between alkaline and rechargeable battery sources with the touch of a button, ensuring uninterrupted illumination whenever you need it. The built-in rechargeable battery is housed in the head of the headlamp and the rear battery cartridge holds 3AAA batteries. With this innovative design, you'll never face the dilemma of drained power. Comfort adjust straps are ideal for long term wear and make this headlamp versatile for a variety of hands-free uses.