With the Doorbell Cam by August Home, you'll always know who's at the front door, even when you're away. One-way video and two-way audio let you speak with visitors while maintaining privacy. Requires existing wired mechanical doorbell system with 16-24V AC of electricity. Requires download of the free August Home app on your iOS or Android smartphone. Connects to your home Wi-Fi and also controls your August Smart Lock (eliminates the need for August Connect for remote access).