A new device uses natural activity to generate electricity.

Nokia has launched a mobile charger kit intended to be attached to bicycles, compatible with any Nokia phone with a 2mm charger jack. The charger takes advantage of natural user activity, using a dynamo to generate electricity with the cycling of the vehicle's wheels.

A Nokia spokesman explains:

To begin charging, a cyclist needs to travel around six kilometres per hour (four miles per hour), and while charging times will vary depending on battery model, a 10 minute journey at 10 kmh produces around 28 minutes of talk time or 37 hours of standby time, the spokesman said. The faster you ride, the more battery life you generate.

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