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The $19 smart pen uses one AA or Ni-Mh battery and every time you need a power backup tool you can connect your cell phone to the pen and wait about 100 minutes for charging. This will provide you with up to 2 hours of battery life or 20 hours of standby in case of emergency.
In addition, it comes with 5 different cell phone adapters matching the most popular models on the market like Nokia, Samsung and Sony Ericsson.

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