contact: skype:dvrelite qq:1019018697 wechat/whatsapp/phone number:+8618938638188 website: www.ahdmdvr.com Language support： Portuguese, Chinese, English, French, Russian, Turkish ●use H.264Video compression format，Hisilicon3520DV200 chip。 ●Software is powerful，MDVR chip and camera use Double Circuit Power Supply,The system is more secure and stable ●4ch video in use aviation port、VGA+CVBS video output， ●1ch audio input 、1audio output，1 VGA output ，1 CVBS output。 ●support one SD card slot （SD max support 256GB）。 ●ACC Ignition start and delay shutdown，4 ch switch alarm input(Optional Accessories)。 ●4Channel screen can menu to adjust left and right and up and down switch，menu set PAL and NTSC format。 ●Wide power input DC8-36V, adapted to automobile voltage fluctuation。 project Device parameters performance index name Product name HX-819BS HX-819BH     System operating system Embedded system，LINUX Operation interface Graphical menu operation interface Interface language Chinese, English, Portuguese, Russian, French, Turkish file system HX Error Correcting Encrypted File Management System         video Video in ４ch AHD 720P Audio in 1ch input VGA output 1ch,support 1920*1080, 1280*720, 1024*768 CVBS output 1ch aviation port PAL/NTSC, 1.0Vp-p, 75Ω，Compound Video Signal video display one scene/four scene Video standard PAL format：25FPS；NTSC format：30fps system resource PAL：100fps, NTSC：120fps     audio Audio input 1ch，600Ω Audio output 1ch，600Ω，1.0-2.2V Recording mode Sound and Image Synchronization Audio compression G711A            Digital Processing and Storage Video Streaming Standard H.264 Image format 4*720P（720*1080） image quality 1-8Adjustable stage Video rate 192Kbps-8Mbps /ch Video occupies storage space 85M-1800MByte/hour Playback resolution 1CH*720P PC 4CH*720P Audio bit rate 4KByte/s storage SD max support 256GB 2.5inch max 1TB   Alarm port Alarm in 4ch input Alarm output 1ch output, MD High, medium and low sensitivity is optional