DoorJammer Portable Door Lock Brace for Home Security and Personal Protection ENJOY PERSONAL SECURITY no matter where you are. Measuring 4.75 inches H x 2.75 inches W and weighing 8 oz, the portable DoorJammer door barricade keeps you safe at home, at the office, at school and on vacation. COMPATIBLE with all types of flooring, the innovative system of hinges and angles anchor the DoorJammer firmly to carpeted, tiled and laminate floors when outside pressure is exerted on the door. TAKES ONLY SECONDS to install and remove. No tools are required to implement this revolutionary home security device. In case of emergency, you can easily remove the DoorJammer with an upward motion. ADJUSTABLE neoprene extension foot needs only 0.3-inch of clearance, and can be used with doors that have high thresholds. Sleep tight in your dorm or hotel room, and protect yourself at work or school. 12-MONTH GUARANTEE against manufacturing defects. We are so confident of our products durability that we will issue a full refund of your purchase price if the DoorJammer fails to perform as promised.