Product: MAXSA Light Up LED Parking Ball, Perfect Parking, Park Right Ball Park 37340
Overall sentiment: negative
Customer reviews:
Its supposed to light up when you tap the ball.  Lets just say you would have to hit the ball and the brakes hard at the same time to get those lights to blink.

Buy the tennis ball and save the difference. 
 Works good but light feature does not work well 
 It's a ball on a string, there isn't much to get wrong. But they got it pretty wrong. The string has a ton of stretch in it, I made it several inches longer just pulling on it. So over time it will get longer and you'll have to adjust it or you won't be pulling up far enough.
Mine doesn't light up at all either. 
 Does not activate with light touch.  Must hit it strong to activate the lights.  I would not purchase again. 
 stop working after a week... replaced it, and same stopped working the light... 
 Its supposed to light up when you tap the ball.  Lets just say you would have to hit the ball and the brakes hard at the same time to get those lights to blink.

Buy the tennis ball and save the difference. 
 Works good but light feature does not work well 
 It's a ball on a string, there isn't much to get wrong. But they got it pretty wrong. The string has a ton of stretch in it, I made it several inches longer just pulling on it. So over time it will get longer and you'll have to adjust it or you won't be pulling up far enough.
Mine doesn't light up at all either. 
 Does not activate with light touch.  Must hit it strong to activate the lights.  I would not purchase again. 
 stop working after a week... replaced it, and same stopped working the light...