Nathan's trail-friendly Zephyr is powered by two AA batteries, and kicks out over 200 lumens of crisp, clear Run-Right Light. Use the 120 decibel fold-out safety whistle to alert other runners—and bears —of your presence. LED: 200 Lumen Main Beam Battery: 2xAA Burn Time: 40 Hours (Low), 24 Hours (Medium), 9 Hours (High) Water Resistance: IPX4 – Weather Resistant Zephyr Trail 200 Hand Torch Usage Instructions