Ares Rescue: ChargeCard for Micro USB with 650mAh Emergency External Power Bank Battery Backup Carry a RESCUE battery with you wherever you go, fits in your wallet! Only 7.5mm thick, and 35 grams in weight. Size of a credit card. Provides an emergency charge of up to 4 hours standby and 1-2 hours talk time. Works with all Android and Micro USB powered devices. Built in LED flashlight and Micro SD card slot for memory storage and media transfer.