Works with Alexa for voice control (hub required, Alexa device and hub sold separately). Exterior Dimensions: 3 x 5 x 1 inches. Interior Dimensions: 3 x 8 x 2 inchesZ-wave technology connects to your home automation system and lets you lock or unlock your door remotely via the web or smartphone3-Alert modes (activity, tamper and forced entry) let you know when someone is coming or going and communicate potential security threatsAnsi Grade 1 - delivered the highest level of Durability and security at the main points of entry and backset is universal latches and deadbolts fit 2-3/8 inches (60mm) or 2-3/4 inches (70mm) backsetsFingerprint-resistant touchscreen protects against fingerprints and smudges and ensures wear patterns remain undetectableDeadbolt automatically retracted from outside by entering valid access codeEasily control who has the access to your home. Memory for up to 30 different access codes means everyone can have their own Number, from the kids to the pet sitter and housekeeperANSI Grade 1 Highest Residential SecurityDurable Resistive Touchscreen with matte finish to protect against fingerprints and smudges