Please note 1. The battery compartment is under the ship podium and it is not waterproof, therefore, do not immerse the whole ship body in the water, or it will cause short-circuit. 2. Please check if the direction of the propeller in the bottom is the same as the direction of the flow, or the boat will tip to one side. Way to Assemble Batteries for Fireboat 1. Remove the screw in the ship podium, then the podium can be removed and the battery compartment can be seen. 2. Remove the screw in the battery compartment and open the compartment. 3. Put 3 AA batteries in the battery compartment. What's About This Product (Fireship): Product Name: Electric Sound & Light Marine Rescue Ship Material: ABS Plastics + Electronic Components Battery Requirement: 3 AA Batteries (not included) Dimension: 8 * 11 * 23cm/ 3.15 * 4.33 * 9.05inch What's About This Product (Wind-up Sailboat): Product Name: Wind-up Sailboat Material: ABS Plastics Battery Requirement: No Batteries Required Dimension: 7 * 9 * 17.5cm/ 2.76 * 3.54 * 6.9inch Please note The color of the windup boat you receive is random.