... , actually 4,000mAh) Battery type: Li-polymer battery Input voltage: 5V DC Features: Works with most MP3 players, PDAs, ... a power button and three LED indicatorBefore charging your device, make sure filling up the power bankWith dual USB ... 4,000mAh)Battery type: Li-polymer batteryInput voltage: 5V DC, 1.0AOutput voltage port 1: 5.0V DC, 1.0AOutput ... Battery Pack for iPad/iPhone/Nokia/MP3/USB Device