Battery Type 1 x 1.5v “AA” Size ALKALINE Battery (Included) Lasts up to 24 hours on one Alkaline battery (Maximum Output: 5.5 hrs) 30 hrs (flashing) Bulb Type Nichia RIGEL 0.5W white LED Output Power 20 lumens Product Size 50 x 51 x 63mm Product Weight (80g with battery) Push button on top to turn on light, push again to flash and again to turn off the light 20 lumens of output power Up to 24 hrs Continuous Use Flashing mode for Emergencies Lightweight / Compact and extremely powerful Rubberised head with scientific Collimator magnifying optical reflector lens