Black portable lithium battery in aluminum shell can charge devices virtually anywhere. Includes standard USB connector cable to charge battery from your computer or any USB port with a power supply. Rated Voltage: 5 V; Rated Capacity: 2200mAh; Input (DC IN): 5V-500mA; Output (USB OUT): 5V 1000mA. Charge time lasts approximately 6 hours. Measures 3¾" x 1" x 1". Screened.