PETZL - Ultra Vario Headlamp, 520 Lumens, Constant Lighting, Multi-Beam, with ACCU 2 Battery 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 COMPACT BATTERY: ACCU 2 ULTRA Lithium-Ion high-performance rechargeable battery (2600 mAh). offers the perfect balance between capacity and compactness, making it comfortable 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.