Klarus HM2 Dual LED Motion Controlled 270 Lumens Compact HeadlampHM2 Dual LED 270 Lumens Compact Headlamp BRIGHT LED HEAD TORCH: The maximum output can reach 270 lumens and a beam distance of 81 meters. The combination of spotlights and floodlights, a beam that can be adjusted by 60 degrees, gives you the best night view. LONG RUNTIME + SOS Whistle: Max 21 hours runtime(30 lumens), 5. 5 hours runtime(270 lumens). With a distress whistle, when you encounter difficulties, you can let your friends know your location