Silva's Trail Runner 4X is made for those who love to run at any time of the day. With an advanced system to brighten up your path whether it's near or far away, you won't have to worry about the darkness and can focus on your run. The torch is easily assembled in several ways completely based on your needs. If you want to minimize the weight on your head, you can use the extension cable included and store the battery in your backpack. This can significantly prolong battery life as battery life is from 2 to 18 hours depending on mode and temperature.