On the SV2 control panel the first button is how to control your filtration pump. It can run in auto, on and off mode. You can manually turn it on for extra filtration, but it will always revert to auto mode, even if you turn it off. The second button is for your jet pump, which runs all the water jets. It is attached to the second filter and can be used for maximum filtration when required. The next button turns on the air bubbles, you can adjust the strength of the air bubbles using the UP and DOWN buttons or push the button twice to choose ramping mode where the bubbles cycle from high to low. If you turn any pumps or bubbles on they will always turn themselves back off after 30 minutes. The last button turns your lights on and off. The colour and affects of your lighting can be adjusted by the UP and DOWN buttons, pushing the OK button to confirm your selections. If you want an extra sanitization and filtration boost after you leave the spa, press the sanitize button. The SV3 control panel is almost the same as the SV2 but there is another button to control your second or third jet pump. With these spas some of the jets will be powered by the first pump, and some will be powered by the second and third pumps. The air bubbles work the same as with the SV2, the SV3 controller has 3 buttons to control the lights. 1 to turn your lights on and off, 1 to select modes using the up and down buttons to make your selection, and another to select colours and intensity. If you wish to invert the display on this control panel, push the invert button and use the sanitise button after a spa for extra filtration and sanitation. The SV4 control panel works just like the SV3 but there are 4 pump buttons.