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 Defender HD Manuals, Firmware & Quick Start Guides What is the Difference between Defender HD and 21000 Model DVR’s? Defender HD | How to format a DVR Hard Drive Wireless HD Manuals, Firmware & Quick Start Guides Defender 4K | How to Watch and Save Footage on Defender 4K (8MP) DVR Security System