Police Security's Twin Power 800 lm Headlamp features groundbreaking, patent-pending technology that redefines traditional dual power functionality. With the touch of a button, you can easily toggle between alkaline and rechargeable battery sources, ensuring continuous illumination whenever you need it. The built-in rechargeable battery is housed in the headlamp, while the rear battery cartridge holds 3 AAA batteries, so you'll never be caught without power. The twist focus feature allows for adjustable beam precision and the comfort-adjust straps ensure a secure and comfortable fit for various hands-free applications. This headlamp is perfect for anyone needing reliable, versatile lighting in any situation.