Portland Design Works Cosmic Dreadnought 110 Headlight Bulb Type: LEDPower Source: AAA alkalineBackup Power Source: noBattery Location: internalBatteries Included: yesVoltage Regulator: noModes: high, low, flashingBulbs: 1Lumens: 110Burn Time: [flashing] 25 hoursWaterproof: no, water-resistantWeight: 91 gRecommended Use: night cyclingManufacturer Warranty: lifetime