Petzl - ULTRA VARIO BELT Headlamp, 520 Lumens, Constant Lighting, Multi-Beam, with ACCU 4 Battery & Pouch ULTRA POWERFUL UNIFORM LONG-DISTANCE LIGHTING: Uniform lighting up to 520 lumens and beam up to 210 meters. CONSTANT LIGHTING: performance does not decrease as the batteries are drained; then switches to reserve mode. HIGH CAPACITY ACCU 4 BATTERY: ACCU 4 ULTRA Lithium-Ion remote rechargeable battery (5200 mAh) offers maximum burn time while reducing weight on the head FOUR LIGHTING MODES: Ambient mode, proximity mode, movement mode, distance vision mode. RUGGED: Waterproof to -1 meter for 30 minutes. Excellent resistance to falls, impacts and crushing.