Defender HD | What’s included This first time setup video will walk you through the contents of your Defender HD 1080P Security System. Related articles What is the Difference between Defender HD and 21000 Model DVR’s? Defender HD | How to format a DVR Hard Drive Defender HD Manuals, Firmware & Quick Start Guides Wireless HD Manuals, Firmware & Quick Start Guides Defender 4K | How to Watch and Save Footage on Defender 4K (8MP) DVR Security System