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Bathroom is the place where children and the elders usually get hurt easily , if heappens on the elders who live alone , it might end up delaying first aid timing.
When the Users walk in the bathroom , they can twist "Guardian" to set how long they would occupy the bathroom. When times up, "Guardian" rings, if there is no one unlock the door or extend the time limit , "Guardian" would automatically call out the emergency number for helps.
Also , Guardian can save water by being a reminder for those who always take showers for too long.