The Fenix E-STAR Emergency Flashlight features three brightness levels and a 100 lumen burst mode which are all powered by an included 1300mAh Ni-MH battery or no battery at all. Recharge the battery by either plugging into a USB power source or by simply pressing the charging lever. This lever activates a built-in super capacitor for electric energy buffering, which can provide continuous lighting even without a battery, and does not need to be maintained by constant pressing. The E-STAR is the perfect tool to have at-the-ready, and never worry about 'if' the battery is charged again.