ThruNite TH10 Neutral White 750 Lumen Single CREE XM-L2 U2 LED Headlamp (Neutral White) Professional all-day, all-environment and all-metal outdoor LED headlamp Adopts an advanced CREE XM-L2 U2 LED emitter to give out neutral white light with the max output to 750 lumens Powered by a single 18650 battery, two CR123 or two RCR123A batteries (all not included) Can shine as little as 0.2 lumens in it's special Firefly mode - perfect for night-adapted vision or avoiding drawing attention With a built-in SOS signaling mode, which can be essential when roaming out in the wild or confronting a dangerous situation