8650 lithium batteries‎,‎ Charge and discharge over 700 times which is 2 times more than ordinary battery‎.‎Intelligent current control‎:‎ when phone power is low‎,‎ the current will be adjusted to large‎.‎Super compatible with the market 99.9 percent of smartphones‎,‎ tablets‎,‎ i‎-Phone‎,‎ MP3 / 4‎,‎ PSP‎,‎ GPS and other digital devices Multiple protection to ensure safe working Portable power box‎,‎ compatible with a variety of electronic devices‎,‎ smart phones‎,‎ tablets‎,‎ bluetooth headset for iPhone and iPad‎.‎Built‎-in rechargeable battery‎,‎ simple design‎.‎High efficiency of power conversion with Electricity‎-saving function ‎,‎ Portable‎,‎ practical and long cycle life‎.‎Safe and reliable‎,‎ perfect for using on traveling and outdoor activities‎.‎Batteries Type‎:‎ 18650 lithium batteries Capacity batteries‎:‎ 5000MAH Operating temperature‎:‎ 5 C‎-45 C Intelligent LED power indicator‎:‎ Yes Material‎:‎ ABS heat‎-resistant fire prevention materials Switch mode‎:‎ Auto‎-sensing Input‎:‎ DC5V‎-1A Input Current‎:‎ 1A Output‎:‎ DC5V / 1A Conversion efficiency‎:‎ 91%