Home and Hotel Security This Portable door jammer is a industrial-strength door security device prevent unwanted entering forcibly protect in home / travelling hotel / apartment.Also suiltable for public buildings schools and offices for all of you. Easy to InstallNo tools. Just takes a moment to fit in the gap under an inswinging door. Place the door lock stopper below the door handle directly then adjust the foot made it tightly grasp the ground. In case of emergency the quick-release removes the lockdown with an upward motion. Note: Testing the door ensure the door stopper firmly fixed in position. Upgraded Door JammerThe upgraded door stopper is made of thick aluminum alloy material anti-crack durable in use. The bottom is made of high-quality rubber material strong grip on floorwear-resistant.Great design uses displacement of force to block the door against attempt forced entry. Make you feel at ease and safer. Convenient to CarryThe security door stopper is very compact and exquisite with an extra storage bag. It is very convenient to carry on business trips and travel accommodation just put in a bag or pocket. Compatibility AllThis door security devices stopper is better suit for door gap 0.12-1.38 inch ( 3-35mm )door thickness 1.18-1.97 inch(30-50mm). Compatible with all types of floors when external pressure is force to the door the hinge and angle system firmly fix the lockdown on carpets tiles and composites.