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A Nashville boy invented a device to remind parents to take their children out of hot cars.

Andrew Pelham, 11, entered the Rubber Band Contest for Young Inventors, a competition that requires the contestants to use rubber bands in their invention. Pelham created the EZ Baby Saver, which stops parents from leaving the car without their child. The contraption straps from the back seat to the front of the driver’s door. It is made with duct tape and rubber bands, and Pelham offers directions on how to make it on his website.

Pelham was inspired to make a difference after learning that about 38 children die each year from being left in hot cars.

“I’m hoping if I can save one life with my invention, I can say that my invention was successful,” he told Nashville’s News 2.

Pelham won second place in the contest, which earned him $500.

Learn more about Pelham and his invention on his website.