This item can be used in various situations, such as for disaster preparedness, in vehicles, at work, or mounted on a bicycle. Specifications are as follows: Batteries used: 4 x AA batteries Bulb type: LED Specifications: Advanced focus, speed focus (slide the head forward and backward), dynamic switch (3-stage dimming) Dimensions (mm): Φ47 x 197 Weight (g): Approximately 356 Total luminous flux (Lm): 350 Light source: Power chip type LED x 1 Illumination distance (m): 270 (maximum) Operating time: Approximately 40 hours (in min mode) Brightness (lumens): 300-499lm Type: LED light Features: Dimmable