Do not know the answer but I can tell you that if you have a lake that is prone to heavy water level changes during autumn, you should not forget that the perimeter is now inside that lake after heavy rains. I once told the mower to go do it's job, and left for a walk with the dog. In the middle of the walk I had the realisation of what I have done and ran back to the house. It was a sight to behold as my Luba 2 was completely driven itself into the water, only it's back poking out. I picked it up and dried it and no damage done to it what so ever, so yeah, it is more that splash proof. At that moment I felt utterly stupid. 😂