Nathan Luna Fire 400 RXA Powerful Runner's 400 lumen lamp with a removable light clip and comfortable elastic strap, designed for wearers waist or chest. RUN LONGER 400 Lumens of clear steady crisp light provides greater visibility of the road and path ahead, when running or jogging in low light conditions. ADJUSTABLE COMFORT sleek Runners Light with elastic comfort strap fits easily on your chest or waist or use the versatile clip to place on a pack, belt, or clothing.