Bright and Adjustable Focus: these mini led flashlight bulk have build in LED light which can gives out 200-500 lumen; The maximum range of light is about 50-100 m; The micro pocket flashlight is powered by one AAA battery, but please note the battery is NOT included Waterproof and Reliable: our bulk flashlight are made of aluminum alloy which is lightweight and strong; They are designed with optical plane mirror which is not breakable and scratch resistant; mini flashlights also have waterproof design which complies with IPX-6 waterproof rating