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A better experience through good design
The snap battery case protects and increase the battery life of your iPhone 4, the case's internal battery can be turned on or of without removing your iPhone from the case, you can also charge of sync your iPhone without removing it from the snap battery case.
Extends iPhone battery life; 30-pin connector for the iPhone 4

Caution:
Do not puncture;
Dispose of in fire or warter, or shred external contacts,
Risk of electric shock, dry location use only