I found this:
"Less startling but cheaper and more immediately useful will be Radius's PowerView, which is an external SCSI box that allows you to hook 12" and 13" monitors to the Classic II and the new notebooks. It does require Color QuickDraw, so it won't help those of you with a Plus or SE, but it will soon support the Pivot and Color Pivot as well, which makes all three machines, the Classic II, the PowerBook 140, and the PowerBook 170, far more attractive for real work."
"Less startling but cheaper and more immediately useful will be Radius's PowerView, which is an external SCSI box that allows you to hook 12" and 13" monitors to the Classic II and the new notebooks. It does require Color QuickDraw, so it won't help those of you with a Plus or SE, but it will soon support the Pivot and Color Pivot as well, which makes all three machines, the Classic II, the PowerBook 140, and the PowerBook 170, far more attractive for real work."