The Fenix E-SPARK Keychain Flashlight is not only a great everyday carry flashlight, but it also operates as a small backup power bank. The power bank is perfect for those moments when you just need just a little extra power before your next opportunity to charge your device. It can charge about 10% of your phone's battery which is perfect in an emergency situation.Specifications and Features: Four quality LEDs with a lifespan of 50,000 hours. Built-in 800 mAh large-capacity Li-Polymer battery. Power bank function for mobile phone charging with USB Type-C port. Lockout function avoids accidental activation. The tail protection cover can be used as a diffuser tip fitted on the light head. Battery level indication for instant checking of remaining battery level. Made of A6061-T6 aluminum. Premium type HAIII hard-anodized anti-abrasive finish.