Don't worry, just use the card battery, you can charge your iPhone/iPod anytime, anywhere through USB2.0 port or with built-in Lithium battery(for emergency use only).
Besides, you can transfer data freely between computer and your iPhone/iPod/iPad.
Cool, can be also a mini flashlight and easily carry with you.
1. Put the switch to USB side and connect the computer/Mac with your iPhone/iPod to start communication and charging.
2. Put the switch to LED side to use it as a flashlight.
3. Put the switch to POWER side to start as a power supply to charge iPhone/iPod for emergency use.
4. Put the switch to the middle location to stop the loss of internal battery.
Output: DC 5V, 1A
Input: DC 3V-6V
Input Interface: USB 2.0
Built-in Battery: 400 mAH
Size: 5.5(W) x 8.6(L) x 5(H)mm
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