Petzl - ULTRA RUSH 760 Lumens, constant Lighting, with ACCU 2 battery ULTRA POWERFUL UNIFORM LONG-DISTANCE LIGHTING: Uniform lighting up to 760 lumens and beam up to 170 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. EASY TO USE: Rotating selector knob is easy to use, even with gloves, allowing rapid access to different modes. RUGGED: Waterproof to -1 meter for 30 minutes. Excellent resistance to falls, impacts and crushing.