The main thing that makes KETO interesting is that it promises to actually replace your car key, not just work along with it. That means you actually have one less thing to carry with you. The device uses Bluetooth Low Energy to authenticate your device with your car. To add another layer of security, it also uses inaudible soundwave technology to make sure that only the correct device is in the car.
Like a smart key, the car will only start when it detects your phone in it, which is quite cool. But you can also use the app to allow others to drive your car. This can all be done remotely, so you can simply grant access to a friend or family member from wherever you are. You can set a certain time limit or manually shut off access when the other person is done with your car.