SECURITY AND PRIVACY The security lock comes with a carrying bag, allowing you to keep it in your pocket or purse. It can be used when staying in hotels or other short-term rentals. While you sleep, someone outside the door cannot open it with a key, greatly increasing your security. Easy to Use The portable security door lock can be quickly installed and removed without any tools or drilling, making it an essential travel security accessory. First, open the door and insert the metal plate into the door lock slot. Second, close the door and place the red handle slot over the metal stud. Installation is now complete. Wide Use Ideal for motels, hotels, resorts, dorms, apartments, short-term rentals, bathrooms, bedrooms, and more. It can also help prevent pets from exiting and children from opening doors. This door lock provides an additional layer of protection; always ensure the main door lock is engaged and do not rely solely on this device. Portable Door Lock Suitable for inward-opening doors with standard hinges and a proper door seal (seal gap 3mm). The upgraded lock features two different hole sizes: 0.87 x 0.78 inches and 1.18 x 0.78 inches. Not suitable for sliding doors, double doors, slatted doors, or swing doors.