A trace input device with function of informing the remaining power of the power supply is described. The device is provided with a remaining power measuring device, and the display form, such as the color or the width, of the entered trace is changed according to the measured remaining power, so that...http://www.google.fr/patents/US5809310?utm_source=gb-gplus-shareBrevet US5809310 - Trace input device with remaining power informing function and method therefor
Trace input device with remaining power informing function and method ...
