Main Features 4 Channel HD Mobile DVR HD 1280 X 720P 4 CH SD Memory SD Card up to 128GB or SSD Digital Zooming Optional GPS Built-in G-Sensor Low Battery Monitoring (Cut-off Function) Keeping: -40~+70℃ WIFI (App) (Apple & android) PC Viewer (OS support : Windows XP or higher version) HD Out & CVBS output Voltage : 12~24V    Specification Specifications Subject Item Value Description Main Inside SoC Hi3521 ARM Cortex A9, 930MHz, 3.5W RAM DDR3:256MB   ROM NAND Flash, 128MB   Buzzer     G-Sensor 3 Axis +/- 2G   Super Capacitor 3.5F x 4   Front Panel Power LED Slide   Power LED Blue On while running GPS LED Green On while GPS is working Event LED Red Blinking when a motion or shock is detected USB1 USB Type A for Wi-Fi dongle USB2 USB Type A for Flash memory disk SATA Tray SSD or HDD* Width:2.5", Height:7 or 9mm SD slot SD SDHC: 8/16/32GB, SDXC: 64GB, 128GB Rear Panel Camera-F   Forward View Camera-B   Backward View Camera-L   Left View Camera-R   Right View MIC     CVBS-OUT Φ2.5mm, 3P    Dimension  Exterior  App Main  Viewer