VMAX A1 G4 Universal HD over Coax® DVR records HD-Analog, HD-TVI and standard coax up to 4K resolution, 16ch, 6TB, 480fps real-time 30fps recording, Up to 4K recording resolution at 112fps (7fps per channel), 8 audio inputs, 1 audio output, 16 sensor inputs, 4 relay outputs, 4K (3840 x 2160) True HD, VGA and Spot video outputs,Free C3 CMS Software, Free Mobile for IPhone, IPad, Apple TV, Android Smart Phones and Tablets, MAC Compatible, USB Backup, Free DDNS,  Watermark Images, Help Menu, Email and Text Event Notification with Snapshot, PTZ Control, Quick Setup Wizard, Pathfinder auto port forwarding, 5 Year Limited Warranty, NDAA/TAA compliant, 5 year limited warranty.