The Fenix E-star is a portable self-powered flashlight for emergencies, including areas lacking stable power supply and disaster-hit areas; as PSK/BOB gear, also it can be used as a backup flashlight for extended outdoor activities. Fenix E-STAR has four different brightness levels. The med and low modes can work without a break by manually pressing the handle. The high and turbo modes aim to provide a better lighting experience when used with a battery. The flashlight allows use while charging, a single-handed pressing for power generation, which is easy even for long-time operation. Another power supply comes from the included low self-discharge Ni-MH battery, a common AA battery can be used as well. And the flashlight supports USB Type-c charging, with the built-in super capacitor, it helps with energy storage and buffering when the battery is damaged or missing.