1.4 channel car DVR , support max 64 GB sd card 2.Front ,sides ,back 360 degress recording 3. ... the outside view and inside people during the Car.Embedded Linux operating system car DVR ,using H. 264 format, compression ... same timeVideo StandardPAL,NTSCImage compressionH.264Audio compressionADPCMVideo modeManual, time, alarm, motion detectionVideo searchTime search, event search, channel searchbackup ...