Background introduction
Every Restaurant has a Cool room for keep food materiel fresh ,it is very important step of keep restaurant running ,the cost is also high!
Customer status
Employee is often forget to close the door of cool room ,it cause a lot of lose for each Restaurant.
Demand analysis
Must create something to remind people to close the door of Cool room  when open the door of cool room.
Solution
Customized Kingsound(Audio player ) with a digital input trigger methods , so once door is open ,it will remind employee to close the door.

Feedback
After use , no employee will forget to close the door of cool soon ,saved a lot of Energy .
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