This CCTV 16 Camera Channel Digital Video Recorder is for those who want to monitor their premises and get crisp clear videos and audio. Yes! Audio! monitor surroundings and hear every conversation easily. Featuring 4 channel video inputs and audio inputs, CCTV DVR with 3G function, iCLOUDfunction for easy internet viewing, all you need to do is simply plug and play. No need for complex settings like port forwarding, domain name settings etc. It can accommodate SATA hard disks of all capacity, has DVD-RW bay, comprehensive menu and is very easy to use, plug in your sim cards or any other USB modem directly to it to connect to the internet. Mobile phone viewing is enabled for streaming live videos to your mobile phone. It also comes with a 5 terabyte hard disk drive installed inside.