Here is an optimized solution for daily power supply and travel use. Our 13000mAh Romoss Sofun 4 Hot USB Power Bank Portable Battery Pack for Mobile Phone supports simultaneous charging and discharging. High security is ensured， for it comes with over-voltage protection， over-current protection， overcharge protection， discharge protection， short circuit protection， over power protection and high temperature protection. It will save you lots of energy owing to the intelligent auto sleep function. Besides， our product with intelligent technology will detect the inner charging management chip of your smartphone or tablet PC. How about taking it home right now?                                    Features            Support simultaneous charging and dischargingWith LED lighting function and support charging two devices at a time13000mAh， rechargeable from the USB port and with intelligent auto sleep function to save energyFit for cellphone， MP3， MP4， console， tablet PC， camera， audio recorder， navigator and other digital products with 5V voltageAdopt intelligent technology to detect the inner charging management chip of your smartphone or tablet PCWith over-voltage protection， over-current protection， overcharge protection， discharge protection， short circuit protection， over power protection， high temperature protection                                                            Specifications            Quantity    1    <br>Material    PC !#!amp!*! ABS    <br>Colour    White    <br>Capacity    13000mAh    <br>Battery Type    Lithium Battery    <br>Voltage    3.7V    <br>Input    DC 5V 2.1A    <br>Output    DC 5V 1A / DC 5V 2.1A    <br>Dimensions    (5.51 x 2.56 x 0.87)" / (14 x 6.5 x 2.2)cm (L x W x H)    <br>Weight    11.08oz / 314g    <br>                                                            Package Includes            1 x Power Bank1 x User Manual1 x Charging Cable1 x Certification