I used to park a 1959 Olds sedan in my modest Wisconsin garage. There were no back up cameras offered in 1959.
I put a tall narrow cardboard box against the wall. When I got close to it the brake lights lit it up. When it moved I knew I was within 6 inches of the wall. That car needed to be that close for the garage door to close.
I agree with the electronic device. Just change the batteries often.
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