【Easy Installation】This add-on smart lock requires no construction. Simply remove the adhesive tape and install. It's also easy to remove. Three thumb turn adapters are included, and the base adapter is adjustable, making it compatible with various doors. 【Voice Control】Unlock your door with a simple command like "Alexa, unlock the front door." Compatible with Alexa, Google Home, Siri, and IFTTT. When unlocking the door with Alexa or Google Home, a registered PIN is required, preventing unauthorized entry when you're away. Siri only supports locking. Requires a SwitchBot Hub Mini. 【Auto-Lock】Automatically locks the door within a specified time. No more worrying about forgetting to lock the door when you leave. 【6 Ways to Lock/Unlock】Unlock and lock the door with just the app. No need to constantly take out your keys. Besides the app, you can also use widgets, Apple Watch, SwitchBot NFC tags, and voice commands. Physical keys are also supported. 【Notification Function & History Check】The SwitchBot Lock can detect the door's status. You can view the lock/unlock history in the app. When used with the SwitchBot Hub Mini, you'll receive an instant notification on your smartphone when the door opens. When the battery level drops below 20%, you'll receive a push notification every 12 hours, and a red light will illuminate with a beep sound to prompt battery replacement. 【Integration with SwitchBot Series】Use it with other SwitchBot series products to make your home safer and smarter! Automatically turn on the TV, air conditioner, and lights when you unlock the door upon returning home. Requires a SwitchBot Hub Mini. 【Remote Operation】When used with the SwitchBot Hub Mini, you can unlock the door remotely. This is helpful if a family member forgets their key or if friends are visiting. Two-factor authentication is required to prevent accidental operation during remote operation. The above is a reprint from A〇zon. I don't know the details. This was purchased on A〇zon by an acquaintance a few years ago and has been stored away without ever being used. Since it has been in someone else's hands once, please refrain from purchasing if you are concerned. I look forward to your purchase if you are interested. Thank you.