Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works well

I bought this for my grandmother so she would know when to stop when parking her car in the garage. The stop sign is a bit little for her to see and the bumper has to really rock that pole in order for the lights to flash on it. I noticed that it doesn't flash all the time, however she knows when to stop when it moves so it is working for her so I gave it 4 stars. I swear this came over night I could not beleive how fast the shipping was. All in all I would buy again.