This device lets you add smart features to your existing lock without having to replace it. SwitchBot Lock is a retrofit device that can be installed on your existing door deadbolt. It works by attaching to your door lock with a strong adhesive tape and turning the lock tumbler with a small motor. It was developed by smart-home robotics company SwitchBot, whose SwitchBot Curtain we previously reported on. The company wants to help automate existing devices by making them smarter, more convenient