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The radio shown below contains rechargeable batteries that are charged by a solar panel on the back. If the radio is left on a windowsill when not in use (during the daytime), the solar panel delivers enough electrical charge to replenish the batteries. This takes a few hours but the electricity is free. When the radio is in use the batteries release their free store of electricity at a constant rate. Increasing the volume uses more stored electricity.

This type of solar radio can already be purchased as well as wind up radios. They are now popular in Third World Countries where batteries are difficult to find and expensive to purchase. The solar panels work well even in countries that see very little sunshine as they slowly ‘top up’ the rechargeable batteries during day light hours.

The solar charger seen below can be used with a mobile phone used by hikers/walkers. The solar panel can be attached to the outside of a haversack. Whilst the hiker walks it charges up the battery, inside the phone (if connected to the phone). It can also be used to charge up batteries that can then be used in torches or radios etc.... Alternatively, the charger can be set up on a windowsill at home and a mobile phone battery can then be charged up.

QUESTION:
Apply solar technology to an everyday electronic device. Draw a design of the device and add explanatory notes.