Maglite – Solitaire LED Flashlight
You might be able to do with the light on your phone if you have one. But if you plan to sleep outside (even for emergency), or doing nightwalks, this is nice to have so you wont use alle the light on your phone.
Uses just a single AAA battery, witch can be purchaced everywhere.
Battery Type: 1x AAA Cell Alkaline
Weight With Batteries: 24 g