Dual Cam TechnologyDelivery Guard™3-Second Preview Videos2K with HDRNo Monthly FeeNote:1. Video Doorbell Dual must connect to your existing wires. 2. The power requirement is wiring with 16-24VAC, 30VA, or more. 3. If your transformer doesn’t meet this standard, you’ll need a new transformer to install your doorbell. Hire an electrician if you’re unsure.