The P17 is a large torch with a long burn time of up to 300 hours due to running on 3 x D cell batteries. The brightness of the boost mode has had a massive upgrade from 450 lumens to 1000 lumens compared to the previous model. Ledlenser's patented Advanced Focus System provides a wide circle of light down to a sharp laser-like long-distance beam. The one handed Dynamic Switch offers three light settings of Boost, High and Low. Comes with : intelligent clip, 3 x D cell batteries Advanced focus system - allows easy changing between broad floodlight and focused long distance beam 3 stage dynamic switch - offers 3 levels of brightness (low, high, boost) Easy one-handed speed focus Ledlenser lights are covered by a 5-year standard warranty, which can be extended to 7 years by registering the product.