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There is no question of a solar cell powering the handset alone, due to the size limitations, but according to Mengelkamp, it is feasible that a cell less up to 25cm sq in area could produce a charge current of 11mA which could be used in parallel with the battery cells to extend standby time of the handset.
The aim is to increase the standby time of the more power hungry multimedia phones to week.
The US market for portable medical ultrasound will reach $330m within the next three years, growing at a compounded rate of 19.2 per cent, according to market researcher Frost & Sullivan.

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