They were originally blue.  I guess in line with their corded range,

then they changed colour...

however, the new model incorporated micro adjustment (circled, +++²)

The colour change was probably because Ryobi didn't want to be mistaken for that other crappy blue line products some dare to call... Bos¢h!

Still have a few blueys,

uses the same battery...

Still, router/trimmer circle cutters are ho-hum... it's the unplanned extent of the dust extraction, that blew me away.

If your first cut is too short... Take the second cut from the longer end... LBD