Power supplier,external battery,Backup battery for iphone 3g 3gs 4g 4gs for ipod touch,nano classic Power supplier,external battery,Backup battery for iphone 3g 3gs 4g 4gs for ipod touch,nano classicFeatures:1900mAh External Battery Charger For iPod iPhone 2G 3G 3GSLight-weight, super-slim design to carry with your machine Conveniently charged via any USB portsHigh-capacity, rechargeable lithium- ...