The JayKay fin is exactly what I was looking for. It's quick and easy to assemble, robust and performs well and is the ultimate gadget for e-fun on the water.

The extended range enables a completely new experience and independence on longer tours. At sea, the fin also gives you good power to get through the waves. In short, simply great. I'm already looking forward to the new version 2.0. Battery replacement "on the fly" sounds like even more speed and range. JayKay keep up the good work!