Product review (5 stars): Great little product.  Works well on my dishwasher.
Love this alert!  I bought one about 12 years ago, just like it.  And worrying if I'd find another in black to go on my new dishwasher, I searched.  I'm happy to say I found this one.  Slide it one way when you load the dishwasher and slide it the other way when you unload it.  Easy Peary.