It is adaptors to ensure charging port compatibility with Mobile smart phone,Very flexible and easy to use.Above all the best New Age Power Bank 8500mah is suitable for all kinds of mobile Smartphone phone and digital devices which have USB cable connector. Perfectly charge tablets mobile, MP3s, MP4s etc High capacity up to 8500mAh Dual-output, Charges two mobiles devices simultaneously Fast Charge, self charge Rugged, Compact, Portable and easy to use.