... surface means 30%, 70% and 100% of the power remaining inside of the battery3. Then use mobile power to charge the phones, iPad, iPhone ... socket to connect by USB and corresponding connector of the mobile phone. 3. The mobile power can charge any digital device which the voltage ... is 5V, such as: ipad, iphone3G, 4G, mobile phones, MP3, MP4, PSP, etc portable power bank charger 5000ma