This item can be used in a variety of situations, including as an emergency kit, for vehicles, for work (can be attached to a belt), and for bicycles. Specifications are as follows: Batteries used: Alkaline AA batteries x 4 Bulb type: LED Specifications: Advanced focus, speed focus [slide the head forward and backward], dynamic switch [3-step dimming] Accessories: Pouch 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): 300-499 lm Type: LED light Features: Dimmable