What a fun toy. After reading the instructions, and installing the batteries, the car came to life and rolled around our living room floor with ease. The included wireless controller is responsive and can control a variety of functions from the direction of the car, to the shooting of the water cannon. When used outside of the water, a reservoir holds a small amount of water for the cannon to fire. When used in the pool, there is a pump that feeds water from the bottom of the car for continuous firing. The led lights are great for when it's a bit darker outside, and are bright enough for indoor play also.The car includes two rechargeable batteries, along with a USB-A charging cable. One battery is installed in the car at a time, so there can always be another on the charger, which is nice. There are two screws to remove and reinstall each time the battery needs to be replaced. This is to ensure the waterproof gasket around the battery area is sealed properly....