LEFEET SEAGULL is an underwater scooter aid developed for water activity enthusiasts, which provides power for users in water activities. It uses double-propeller propulsion, non-contact switch control, replaceable battery design, and modular design to provide various uses in water activities. Three application modes can be utilized through different accessories: The floating board mode is mainly for beginning swimmers and can assist learning to swim; The handle mode is mainly for underwater sports enthusiasts, suitable for scuba diving and free diving; The inflatable mode is mainly for swimming pool leisure and entertainment, suitable for water parties.