Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Piece of mind

I bought this after hearing about a horrible accident of college girls who accidentally drove into water and couldn't get out of the car; drowning all the girls. Every car should have one. A very inexpensive piece of mind. Carry the keychain hammer for the times you are riding in someone else's car. Don't forget; if your car goes into water; the engine stops and you can't get your windows to work. Unless you still drive a really old car with manual windows. Perhaps automotive companies should find a way to either build a hammer into the drivers side door or make a manual override so that windows can be lowered without power. It's a good item to have handy and hope you never need to use it.