The WG779E.2 is a relatively new kid on the block (2018) and was introduced to replace the 40v WG776E. The main difference is it uses two 20v batteries simultaneously as opposed to the one 40v. Why? well because WORX wanted to standardise batteries across their range of cordless garden tools.
Intellicut – technology keeps constant cutting power even in dense grass
Cut to edge Design reduces uncut grass around edges