Power through the darkest conditions with the Princeton Tec Quad Headlamp. Four Ultrabright LEDs give you up to 150 hours of burn time with three AAA batteries. Super lightweight and waterproof. Sophisticated circuitry regulates the voltage to the LEDs, giving you maximum brightness longer. Ultrabright LEDs are the highest quality LED available. They provide a smooth, white, wide beam light. A single switch gives you four light modes low, medium and high brightness settings and a high blinking mode. Waterproof to 3.3 feet. The Quad is a lightweight powerhouse only 3.4 ounces. The head rotates 90 degrees to light things from the book in your hand out to 80 feet. The Battery Power Meter gives you feedback on the condition of your batteries. It allows you to make educated decisions about how soon you need to change them. Three AAA batteries included.