Upgrade your CCTV security cameras using your original RG59 or RG6 Coaxial Cable wires. This HD DVR is the latest breakthrough in CCTV equipment allowing any combination of original standard resolution analog cameras plus your new HD-TVI cameras. This DVR also allows up to 1 high definition HD-IP camera up to 2 megapixels to be added, making it a true 5 channel recorder. This plus our 3-year warranty make this a must have upgrade for your security system. Instantly upgrade to HD Security by adding one or more new TVI camera, or change them all to see the amazing quality! If your budget is tight, add the cameras where you need the most. This DVR records both your existing cameras and new HD-TVI cameras plus up to 1 additional IP camera! The DVR senses the camera type and automatically adjusts to record. This TVI-DVR plus an HD-TVI camera (up to 2.1 megapixels) will be approximately 6 times the resolution of your original camera. Keeping your old wires and connections makes the upgrade as simply as installing a light bulb. This DVR is remotely compatible with Windows (all versions), Mac, Android and iPhone. The application for this HD-TVI DVR is iVMS-4500. This technology allows for long distance cable runs up to 1000 feet. No more power boosters or short runs required. You can also keep your old power supply to power the new cameras. You can swap out your existing SATA hard drive or purchase our Western Digital 'Purple' (Surveillance Grade) hard drives with a 3 year warranty in all of our DVRs. We offer great comfort by offering a 3 year warranty for both the HD-TVI DVR and the WD Purple Hard Drives.