Please make sure to soak cleaning with fresh water after using the device in seawater, to avoid seawater or any residual foreign objects corrosion on the propeller or other parts. Make sure the battery charging port does not have any contact with seawater, to avoid seawater corrosion. Please be aware that, for maximum use time, this device can reach up to 45 minutes, but it may vary due to the environment/user's weight or flow resistance. To better extend the battery life, after using the underwater scooter, it is best to fully charge the battery pack store it separately, and then charge it again every 2 months.