LockMate™ Personal Safety LockHigh sensitivity alarm This Portable door jammer is an industrial strength door security device, that prevents unwanted entering forcibly, High sensitivity induction, will alarm as soon as it vibrates, guarding your sweet sleep. Also suitable for public buildings, schools, and offices for all you. Upgraded Door Jammer The upgraded door stopper is made of thick aluminum alloy material, anti crack, and durable in use. The bottom is made of high quality