Ultra slim design with advanced features. Includes 24 VAC transformer, Chime, and 4 interchangeable faceplates. Professional-installation recommended. With 1080HD video, two-way audio and customizab Doorbell Pro is our most advanced doorbell yet. Get instant alerts when visitors press your doorbell or trigger the built-in motion sensors, and see, hear and speak to anyone at your door from your ultra-slim design and customizable faceplates, Ring Pro has a finish to match your home and your style. Requires Existing Doorbell Wiring Compatible With iOS, Android, Mac and Windows 10 Devices Live Instant mobile alerts Motion-Activated Alerts