This is a set of sesami 4 and sesami touch. By purchasing this set, you no longer need to carry keys, eliminating the worry of forgetting your keys at the office or losing them. Furthermore, by setting up the auto-lock (timer-based), you won't have to worry about forgetting to lock the door, alleviating the obsessive thought of "Did I lock the door?" every time you go out. You can also share guest keys with roommates or friends via the app. Unlocking is supported via smartphone app, fingerprint authentication, and NFC contactless authentication, allowing you to open the door instantly with your finger or Suica card. You can also lock the door by touching it with an unregistered fingerprint, so you really don't need to use a physical key. It can be easily installed on most thumbturns, so it can be used in rental properties or when you move. I have been using it for about 2 years and it works without any problems, and I don't think there are any particularly noticeable scratches. The battery was replaced with a genuine sesami battery in mid-December 2025, so you can use it with confidence. Also, the thumbturn base has been replaced with a reinforced new repair part. There is no box, only what is shown in the photos. As a reference price, purchasing the main unit alone from the official website costs 9,736 yen including shipping.