I believe it is this one (or an OEM variant): https://www.sram.com/sram/urban/products/automatix https://www.sram.com/sram/urban/products/automatix I think it

I believe it is this one (or an OEM variant): https://www.sram.com/sram/urban/products/automatix https://www.sram.com/sram/urban/products/automatix I think its gimmicky. If you're going to bother with internal hub gearing, you might as well make it manual-- its even easier than shifting a derailleur and you don't need to be moving. Its not like automatic 2-speed shifting is solving a real problem.