Hi, hope my info help., if it is wrong please correct me :

Gen 1 : Used 2 AA Battery, need plat surface to detect click (2 rubber below sense clicking)

Gen 2 : Internal battery with lighting charging, is a force touch (Taptic engine) sensor, mean no moving part, entire trackpad glass surface has pressure sensor, just like Macbook after 2015.

Gen 3 : Enhanced bluetooth connection, slightly rounded design, enhanced connectivity when using with M series processor Mac.

This post has been edited by PowerPC: Feb 28 2023, 04:15 PM