The Door Jammer only weighs 8 oz and measures 4 3/4" tall by 2 3/4" wide, no taller than a cell phone... But don't let what it weighs and it's size, fool you into thinking it isn't strong or reliable! It's rubber coating that goes against the door, bottom of it and under the stopper, prevents it from sliding. Making it impossible to open any entrance! It works perfectly on wood, tile, carpet or any other type of flooring. But keep in mind that it can only be used on entrances that have at least 1/8" gap, under the door! Beware, some exterior doors don't have a gap under them. This Jammer will most likely not work for example, if you are in a hotel room that has an exterior entrance.
This tool is small enough to put it in your purse, briefcase or backpack. It's simple to place under a door and adjust. You can also remove it very quickly, in case of an emergency. Perfect for college dorms, hotel rooms or just at home, when you need more privacy!