Costco shows an i4 robot to compare with the i7+ on its site. The link to the actual listing for the i4 does not work though. It appears that the i4 somehow
Compare iRobot Roomba 676 vs Mova Z500 - Robot vacuums
Comparer les prix : IROBOT R974040 Aspirateur Robot connecté iRobot ROOMBA 975 | Comparateur KultureGeek