Sony on Thursday unveiled a prototype digital camera with a wheel that can be turned to generate enough power to take pictures.
The "Twirl N' Take" camera generates enough electricity for one snap if the the wheel is moved for some 15 seconds, according to a Sony official.
A digital camera similar to those used in mobile phones is installed in a handle attached to the wheel, which is equipped with a power-generating device.
Moving the wheel and taking pictures would appeal to children but the company has no immediate plan to commercialise it.
As the camera has no screen monitor, users must connect the device to a computer to see their pictures.
The device is showcased at the "Eco Products 2007" environmental exhibition in Tokyo, held 13-15 Dec.