I got these safety light "pucks" for my roadster in case of emergency. They have multiple settings for the flasher part, they're rechargeable, allegedly last up to 18 hours, a built in led lite on the top so that it can be used as a flashlight and a hook and magnet so that you can hang it or attach it so that you can work hands free. It comes with a 3 connector usb charging cord, so that you can charge all 3 pucks at the same time. It doesn't come with the plug to go into an electric outlet. It also comes with a carrying case. The case is about 5 - 6 inches tall and about 4 inches diameter. I thought it was a great deal.