Guardian In-D3416SSBHS H.264 16 Channel Security Surveillance CCTV Video Recorder Standalone DVR System with 1 TB Hard Drive Preinstalled (Black) 16 Channel WD1 record and playback surveillance DVR. Powerful Plug and Play function to solve the complicated network set problem. Powerful Push alarm function to push every alarm information to your cell phone. Compatible with a variety of browsers, including IE10 (32bit and 64bit),Safari, Chrome and Firefox. FTP function and e-mail alerts with snapshot. Free DDNS; Free client software base on MAC OS and Windows; Free App for iPhone/iPad/Android/Windows phone.