Instant purchase is okay. I bought it, but I haven't used it and have just been storing it. The film is still attached. I'd like to pass it on to someone who will use it^_^ Amazon price: 2,880 yen (as of June 23rd) Reels Home Premium Door Lock, Retrofit Room Key [Japanese-operated brand] Child Lock Door Key No Construction Interior Retrofit Cat Escape Prevention Black [Easy installation, no construction required] You can choose between double-sided tape or screws. Easy installation without construction or drilling♪ Easy to install and unlock with one touch! Easy lock [Simple and suitable for any home] The stylish appearance fits any home without ruining the atmosphere of the room. [Made of aluminum alloy] It has a high-class feel, so it's perfect for your father's room or the living room's interior door. It won't rust even if it gets wet! [Safe for families with children] It can be unlocked with one hand, making it easy for busy mothers to use as a child lock. It's designed to be difficult for children to open, so you can rest assured! [30-day warranty] Reels Home products come with a 30-day quality guarantee. If there is a problem with the product, we will accept returns and exchanges, so please rest assured. [OK for rentals! For retrofitting interior keys] For interior keys in rooms that didn't have keys. Also for preventing family members from wandering, etc.