In constant mode, LED throws light 100m and outputs 215 lumens on high, 75m and 100 lumens on medium and 25m and 45 lumens on lowRed LED positioned to the side of the white LEDs lets you preserve your night vision or use the headlamp as a blinking light to increase your visibility in urban environmentsIntegrated 1,800 mAh lithium-ion battery recharges with the included micro USB cable via any standard USB port; battery charge indicator lets you know when charging is doneBattery recharges in 4.5 hrs,
and can be recharged up to 300 times, making the battery life equivalent to that of hundreds of alkaline batteriesBattery provides 2.5 hrs,
of use in high Reactive and constant modes and 10 hrs,
in low Reactive and constant modesLithium-ion battery can be replaced with a 3 AAA batteries (sold separately) and a battery pack adapter (not included) for use when you can't rechargeComfortable headband is easy to adjust; two-part construction at the back of the head supports the weight of the headlamp during active