There are scratches because it fell a few times during operation. The position didn't align, possibly because it didn't fit the doorknob, so I've attached an adjuster for round knobs. In addition, because the position still didn't align, I've filed down the part that grips the doorknob, so it may not fit your door. It was working a year ago, but when I checked the operation now, it doesn't work even with batteries inserted. It might just be due to battery degradation, but please consider purchasing it mainly for parts or other uses. SwitchBot Smart Lock Pro Key Smart Key - Switchbot Auto Lock Door Lock Entrance Smart Home Smartphone Operation Compatible with Alexa Google Home Siri Remote Operation Easy Installation Anti-theft Measures Retrofit Black Retail Price: 17,800 yen