1. Universal mobile power bank 2.Lasting power supply, perdect sound experience 3.What multi brings you is not just wonderful battery endurance, extraordinary voice, but also a kind of life, a kind of enjoyment. 4.3.5mm aduio line connect your mobile phone, enjoy music any where. 5. 3500mah supper play time. 6.Intelligent control circuit, to protect the short circuit, overcharge, over-discharge and over-current, to ensure that your product will not charge any harm, it let you travel worry-free