Schlage BE479 V CEN 619 Sense Smart Deadbolt with Century Trim Satin Nickel (BE479 CEN 619), Works with Alexa Hands-free voice control requires Schlage Sense WiFi Adapter and Alexa device (sold separately) Free iOS and Android smartphone app lets you manage codes, set schedules and view usage history Lock and unlock from anywhere by pairing with the Schlage Sense WiFi Adapter (sold separately) Pair with Apple HomeKit devices to use with iOS and Siri voice control only Secure encryption. Door thickness range: 1.37 to 1.75 inches