This is a vintage Star Sensor Lazer Tag Star base from Worlds of Wonder. This does come with the battery cover and there is no rust or corrosion inside the battery terminal however, I have no way to test this so it is being sold as is for parts or repair. Buy 1 or both if they are both still available This sale is for 1 at this price. If you have this set, I would definitely recommend that you buy both of them because parts are going to be very hard to find later