The Halo Touch fingerprint smart lock allows you to simply use your unique fingerprint to lock and unlock your door. With up to 100 fingerprints (50 users), you can give access to your family and friends with their unique fingerprint and manage access through the Kwikset app. You can also lock and check the status of Halo using voice commands with Alexa and Google Assistant. This single cylinder deadbolt can be locked or unlocked by using the keypad or key from the outside as well as the turn button from the inside. The crisp, clean appearance of the Satin Nickel finish adds to the overall look of the product and brings a modern feel.