The Eos light takes self-contained battery lighting to the next level! The combination of a Maxbright 1 watt LED and the Princeton Tec-designed optimized lens/collimator maximizes the beam by balancing long-throw with localized lighting. Recognizing that different amounts of light are needed for different activities, we've equipped the Eos with 3 brightness levels and a blinking mode; further ensuring that the Eos will remain at Constant Brightness as long as the batteries have sufficient voltage. The use of high-grade materials ensures durability and strong resistance to water/weather/environment conditions. Power: 25 Lumens Lamp: 1 Maxbright 1 Watt LED Burn Time: 60 Hours Batteries: 3 AAA Alkaline Weight: 105g Princeton Tec