SECURITY AND PRIVACY The security lock comes with a carrying bag, you can keep it in your pocket or purse, you can use it when you stay in a hotel or other short rentals term.you sleep, someone outside the door cannot open the door with the key, greatly increasing your security. Easy to UseThe portable security door lock can be quickly installed and removed without any tools or drilling, it is an indispensable security assistant for travel. The first step is to open the door, insert thesheet metal in door lock slot; the second step, close the door, then put the red handle slot on the metal stud, the installation is complete. Wide UsePerfect for motels, hotels, resorts, dorms, apartment security, short term rentals, bathrooms, bedrooms, etc. It can also be used to prevent animalsto go out and prevent children from opening the doors. Door lock security is the second layer of protection and you should also lock your door instead of relying on it. Portable door lock Suitable for doors with hinges that open inwards, there must be a suitable door seal (door seal 3 mm), the improved door lock has two door holes of different sizes: hole0.87*0.78 inch gate; 1.18*0.78" Door Hole: Not suitable for sliding, double, slatted and swing doors.