Here is an optimized solution for daily power supply and travel use. Our 7800mAh Romoss Sofun 3 Hot USB Power Bank Portable Battery Pack for Mobile Phone supports simultaneous charging and discharging. It could be reused for up to 500 times in total. And 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 provide you with up to 90% conversion rate. How about taking it home right now?                                    Features             Support simultaneous charging and discharging<br> Could be reused for up to 500 times in total<br> 7800mAh， rechargeable from the USB port and with intelligent auto sleep function to save energy<br> Fit for cellphone， MP3， MP4， console， tablet PC， camera， audio recorder， navigator and other digital products with 5V voltage<br> Adopt intelligent quad-core technology to offer up to 90% conversion rate<br> With over-voltage protection， over-current protection， overcharge protection， discharge protection， short circuit protection， over power protection， high temperature protection<br> With LED lighting function and support charging two devices at a time <br>                                                            Specifications             Quantity     1    <br> Material     PC & ABS    <br> Colour     White    <br> Capacity     7800mAh    <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     (4.02 x 2.56 x 0.87)" / (10.2 x 6.5 x 2.2)cm (L x W x H)    <br> Weight     7.23oz / 205g       <br>                                                             Package Includes            1 x Power Bank<br>1 x User Manual<br>1 x Charging Cable<br>