Just received my jebao sw2 wavemaker. I've used jebao products in the past without any issues. I have a rw-4 but I misplaced the controller so I decided to order a new pump. I found out they had an even smaller wavemaker. Here's some pictures in case any one is interested in the size comparison. The sw2 is about the size of a golf ball perfect for smaller tanks. Another thing to note is that even though the sw2 magnets are smaller, the are twice as strong as the rw4s