DVR-M704E and DVR-M704EG (GPS option) are industrial-strength DVRs specially designed for vehicle environments.They are suitable for cars, buses, trucks in various application fields: taxi, school buses, police patrol cars, truck fleets, government vehicles. The no-fan and anti-vibration design make them also suitable for marine industry on boats of all sizes. Mobile Industry Standard Size: 1 DIN size (standard size of a car CD player). Power Adapter: professional mobile power supply - provides protection against high-voltage, low-voltage, short-circuit and over-current. Anti-Vibration Design: unique built-in shock absorption in HDD box design, comprehensive mechanical shock protection, electronic shock absorption and the integration of patented anti-seismic shock software. No Fan Design: it effectively eliminates the problems associated with cooling fans in the areas of extra noise, easy dust cumulation, water penetration, high power consumption and high heat. Removable HDD: removable professional anti-seismic design HDD that can be locked or moved for direct connection to computer. Quick Backup: Backup through removable hard disk, USB device backup or network backup Convenient Operation: multiple ways of controlling the system: remote control unit, USB mouse, keyboard, PTZ controller or usage of a special extension line. Watermark Technology: proprietary watermark technology prevents video data modification. Text Overlay: vehicle plate number, date/time, channel title, alarm, GPS info, and/or vehicle speed can be overlayed onto the video. Powerful Alarm Functions: records, pop up, alarm logs, alarm info and various types, including the motion monitoring, video loss, video shielding and temperature abnormal, voltage abnormal, over-speed, buzzer alarm Secondary Backup: SD card can be used to backup important video and/or alarm logs. Comprehensive Network Features: dual-network ports, dual-stream encoding of network self-adapting, transmission resumption after breaking, remote video surveillance, downloads, picture snapshots, remote alarm and network status display, and remote maintenance. Main Processor High performance embedded microprocessor Operating System Embedded LINUX User Interface GUI, on-screen menu tips Control Device USB mouse, IR remote control, DAHUA keyboard External Interface 2 USB2.0 ports, 2 RS232 ports, RS485 port, 2 RJ45 ports (10/100M), Alarm input and output (4 input and 2 output) Storage Device Main memory: removable 2.5" SATA HDD Auxiliary memory: Support 2 SD cards Backup: USB storage device Video Input 4 channel, BNC, 1.0Vp-p, 75¦¸ Video Output 2 channel TV output, BNC, 1.0Vp- p, 75¦¸ Video Standards PAL(625Line, 50f/s), NTSC(525Line, 60f/s) Real-time Live Display Resolution: D1: 704¡Á576(PAL)/720¡Á480(NTSC) Video Compression H.264, Dual streams Video Resolution Format CIF QCIF NTSC 352 X 240 176 X 120 Video Recording CIF/QCIF: PAL 1f/s~25f/s, NTSC 1f/s~30f/s Audio Input 4 channel, BNC, 200-2800mV, 20K¦¸ Audio Output 2 channel, BNC, 200-3000mv, 1K¦¸ Audio Out S/N Ratio High than 75dB Audio Compression PCM, Sampling frequency: 8KHz, Sampling bits: 16bit Network Wireless Support CDMA/GPRS/EDGE, WLAN Remote application Real-time monitor, snapshot, recording search, system configuration Vibration-proof 5Hz~300Hz: X / Y / Z every direction 8 hours, 5Hz~11Hz: vibration amplitude 10mm, 11Hz~300Hz: 50m/s2 Electromagnetic compatibility GB 13837-2003 Power Supply +12V / +24V / +42V (+8V~+60V) Rated Current ¡Ü1A (including HDD) Starting Current ¡Ü1.5A Power consumption <15W (including HDD) Working Temperature -10¡æ~+60¡æ / +14~+140¡ãF Working Humidity 10%~95% Dimension 1DIN: 200mm¡Á178mm¡Á50mm / 7.87"x7"x1.97" Weight 2.1KG / 4.63lb£¨including HDD£©