When your clock runs out of battery, it stops the time but not this solar clock which receives its power from sunlight or artificial light and then converts that light energy in to electrical power required to drive the clock.
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Unlike many other solar clocks, this solar clock can also be used indoors as it also gets charged via artificial light and will always keep ticking and showing the current time without any halt. It comes in a stylish casing and can be used indoors, outdoor, garden or you can even leave it on your desk. At night a single AA size backup battery will keep your solar clock ticking so do not need to keep the lights on. This solar clock will start to work from the moment you expose it to any form of light.