The Series 2 Pro is a higher spec version of the Series 2. It has enhanced diagnostics in the control box so if anything were ever to go wrong it is much easier for us to identify the problem. It also has upgraded gearing in the motors and the components are all to higher tolerances. The Pro is also an improved version aesthetically with hidden glide holes on the legs and an improved design on the feet of the frame too.
You can use the Bluetooth function on the handset to connect to a Standing App for your iPhone or Android phone allowing the option to control your desk height, memory function, customised sit/stand cycle, tracking/calculating calories burned and safety support-error alarm notices. There are twin USB ports on the handset.
For a full analysis see this page https://www.gostand.ie/pages/desk-comparison-v3