EverSecure's four- channel DVR box provides high-performance, stream-based DVR functionality. The DVRU-4204 is a DSP-based system with a USB 2.0 interface to the host computer system. The system provides real-time digital data transfer and supports up to four-channel video and audio signals. Each channel can be compressed independently in 30 fps at 320 x 240 pixels in MPEG-4 format. Remote access control is available via TCP/IP, ISDN, PSTN and ADSL. An RS-485 interface, powered via USB, is available for the PTZ control.