Nitebeam 900F - 900 lumen 3 mode focusable & Nitebeam 900HL-R 900 lumen - 3 mode headlamp 900 Lumen & 900 lumen 3 modes - high, med, low - both 900HL-R & 900F uses 1 ea 18650 battery (included) or 3 ea - AAA batteries (not included) Adjustable & replaceable strap Aircraft grade aluminum