Key Features Small volume,Super capacity of 20000mAH. Double USB interface,can charge 2 mobile devices at the same time. Intelligent LCD display. Good compatibility.Compatible for Smart Phone/PAD/MP3/PC/Digital Camera/IPOD/PSP. Intelligent sleep,After not working for 60 seconds, automatically enter a dormant state, minimize power consumption. Intelligent fast charging,to charge iphone fully just 2 hours. Intelligent protection to prevent overcharging, overdischarging, overvoltage, overcurrent, over power,overheating and short circuit.