SECURITY AND PRIVACY The security lock is equipped with a carrying pocket bag , you can put it in a pocket or handbag, can be used when staying in a hotel or any other short-term rental. When you fall asleep, someone outside the door cannot open the door with the key, which greatly improves your safety.EASY TO USE Portable safety door locks can be quickly installed and removed without any tools or drilling, apartment must-have security helper for travel. The first step is to open the door and insert the metal piece into the slot of the door lock the second step is to close the door, and then put the red handle groove on the stud on the metal piece, the installation is complete.WIDELY USED Perfect for motels, hotels, resorts, dormitories, apartment security, short-term rentals, bathrooms, bedrooms, etc. It may also be applied to avoid pets going out, and also to prevent children from opening their doors to strangers.The door lock security is the second protection,you also should make your door been locked, instand of relying on it.PORTABLE DOOR LOCK They are suitable for doors that have hinges and open inward, there must be a proper door gap (door gap 3mm), The upgraded door lock has two different sizes of doorholes: 0.87 x 0.78 inch doorholes1.18 x 0.78 inch doorholesThe size is not suitable and can't be used (note: please measure the size of your own door buckle before buying, to avoid buying it and can't use it) Not for sliding door , double open door , slat door , and swing out door.Note: Not for sliding door , double open door , slat door , and swing out door. Please double check the product picture size and the use of the scene match before buying, so as not to lead to the purchase of the wrong goods, thank you!