3V Lithium Cells Last Over 65 hrs & 25 hrs, Atex and IECEX Certified Zones 1 & 2, Easily Attaches to Clothing and Equipment, Fitted with Integrated Clip & Cable Tie Slot, For Indication in Explosive Gas & Dust Atmospheres, IP67 Rated, Small & Lightweight at 23 Grams with Batteries, Supplied with Batteries, Ultra Bright ’Fitted For Life’ LED, Visible Over 0.5 Miles/0.8 Kilometres Away in The Dark