Stream light micro light. Runs off 1 AAA battery, weighs a few ounces, clips on a hat or headband and is super bright. Goes with me everyday. I think they’re like $25-$30
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A friend of mine once lost his. Probably 2 years later I found it riding around in the tonneau cover rail of my truck. I never used the cover so it had been rattling around exposed to the weather for 2 years straight lol. Fresh batteries and it still worked.