3S

The Air Lift Performance 3S system is an interesting product. While at first you may think the 3S is just an air manifold that looks like a 3H/3P version, in reality the 3S is an entry level digital leveling system that's a good way to get yourself into the market. 

The "S" is for "Standalone," which means the 3S can work without a wired controller. Instead you can use the Air Lift Performance app, which saves you some money. It's not just an air manifold, either. The Air Lift Performance 3S does have a time-based lift system, so if you push a button on the virtual controller it will open and close the valves for a set duration to lift yourself to around your desired ride height. It's pretty neat. 

But it's also affordable, as it's cheaper than both the 3P and 3H. And yet you can upgrade to either of those systems if you like. It's what makes the Air Lift Performance 3S such a neat system, and an easy way to get into digital height adjustment.