Defender HD is a free app available on Android that allows users to create an account, add their system, and view or interact with their footage from their smartphone or tablet. The app is specifically designed for Defender HD and Defender HD Wireless DVRs, making it a perfect solution for users who want to manage multiple DVRs in one place.

The app's features are impressive and user-friendly. For instance, users can view their live video feeds, receive push notifications when motion is detected, playback recorded footage, and even capture images or videos to their smartphones or tablets. Additionally, users can add and view multiple DVRs simultaneously, making it easy to manage all their systems from a single app.

However, it is important to note that the app requires a high-speed internet connection and router, which is not included. An internet connection providing an upload speed of at least 1Mbps is recommended for the best video performance. Overall, Defender HD is an excellent app for users who want to manage multiple DVRs and stay connected to their security systems on-the-go.