I present to you the famous flashlight (XA-819 M300), which combines small size with lighting power you wouldn't expect from a medal flashlight.
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It comes with a magnet on its back.
The lighting is very strong and covers an excellent area (several lighting modes: strong, medium, emergency mode, detecting counterfeit currency with UV light).
Size: Small and light, it fits on your keychain and won't bother you in your pocket.
It charges via USB Type-C (fast and practical).
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It is shock-resistant and water-splash resistant (suitable for the desert and camping trips).