【Universal 9-Inch Quick-Release Fin Mount】Designed with a standard 9” fin mount, the tool-free quick-release base installs or removes in seconds. Fits most SUPs, kayaks, canoes, and inflatables, making setup effortless wherever you go.
【Powerful 400W Brushless Thrust】Experience up to 20 lbs (9.3 kg) of thrust from the high-efficiency 400W brushless motor, delivering speeds up to 9.6 km/h (6 mph). Perfect for powering kayaks, SUPs, and inflatable boards with smooth, quiet propulsion.
【Smart Wireless Bluetooth Remote】The Bluetooth handheld controller delivers instant response and precise control. Easily adjust speed, switch directions, activate cruise mode, and monitor real-time speed, battery level, and RPM at a glance.
【One-Touch Cruise & Long Runtime】Enable cruise control for hands-free gliding and extended endurance. (Note: Package includes K4 motor and remote only — waterproof battery sold separately.) Ideal for long-distance paddling or relaxing exploration.
【Lightweight, Durable & Portable】Weighing only 2.6 lbs (1180g), the K4 Electric Fin combines compact design with rugged durability. Enjoy smooth steering, agile maneuvering, and stable cruising across waves with minimal drag.

















