This article is from the Baby Proofing FAQ, by Sandra Smith, firstname.lastname@example.org with numerous contributions by others.
From: Judy Leedom Tyrer, Locus Computing Corporation, Los Angeles, California
Well, I can tell you I hate ours. We got one that you don't permanently
attach, but it uses a foot clamp that pushes two rubber pads up against the
edges of the doorway. Well, it falls out with the slightest provocation.
I think it was made by Gerry. Grey with a blue foot pedal. It DOES have
hinges you can use to permanently attach it, but we wanted to be able to
move it from room to room.