On revision 2 they replaced the motors with a sealed design. The shafts that house the motors are completely sealed and use magnets to drive the propellors. On revision 3 they have the same sealed motors but the power button is a lot smaller. I’ll post pictures in my thread of the propellors and shafts when I replace mine when I get the appropriate propellors in. They just overnighted me a new set.How is this one different. I noticed (I think) on my newly repaired one that the motors are different, or at least different from each other, but otherwise it looks the same as my first Betta.