WUDN Fast Charging 4000 mAh Ultra Slim Built-in iPhone Lightning Cable and Micro USB Plug - Black/Cedar Wood Light & portable: Pocket-size ultra thin compact portable external battery power bank equipped with fast charging technology Fastest charging pocket-sized external backup cell phone battery (2.4 amp) lasts 600+ cycles (2+ years) Safe grade a premium li-polymer cell high-quality portable power bank charger meets highest safety standards