Headlamp with rear switch.LED will not break when dropped and its life expectancy is well over 50.000 hours.Waterproof design for all weather use.Beam produces a bright spot with almost no peripheral light so nearby personeeel are not affected.Attaches to all work helmets using UK accessory clips.UK 10-year warranty.Weight 177g.Batteries:1021222 - 4AA alkaline.Brightness:120 lumens.Distance seen:192 m.Burn time: 4-5 hrs. Certification ATEX: II 2G EXe ib IIC T4,II 2D Ex ib D21 T98°