The S1 Pro is a palm-sized sea scooter rated to 40 meters. You hold it, strap it to an arm, or clip it to tank webbing; batteries pop out in seconds, and each charge runs roughly 35 to 70 minutes depending on speed. The batteries are airline-safe, so it travels in carry-on. Double it up and the twin rig pushes serious thrust for scuba, snorkeling, or towing a paddleboard.
4.2 stars across 53 Amazon ratings, backed by a long crowdfunding history.
Who should buy: divers and snorkelers who hate finning against current. Who shouldn't: casual pool users — this is ocean gear.
