This product is a backup power supplier for emergency,environmentally friendly,it can be recharged by hand, it also can be charged by external power supply,it can easily put in your pocket or your briefcase.your phone will never powered off,you can be secure of doing your business and don't worry about your battery died will carry troubles to you.1.The product is designed with an internal voltage regulator circuit,it can output stable power and easy to charge your cell phone.2.Standard USB interface, 5V output, it can charge for a variety of USB devices and mobile phone.3.It is with IPHONE recognition,it can charge for your IPHONE.  Dimension: 121.5(W)*73(D)*49.5(H) mm