We are professional supplier in Mobile vehcile DVR with 3G,GPS,WIFI,WAN.Currently we have the following 5 models:M880X (X=1, 2 , 3) with 1-CH D1 + 3-CH CIF resolutionM8801 with 3G + GPS;M8802 with GPS (USB port);M8803 without 3G or GPS (USB port);M990X (X=2,3) with 4-CH D1 resolutionM9902 with Wifi + WAN + GPS (USB and RJ45 port);M9903 with Wifi + WAN (USB and RJ45 port). M8801 and M9902 are the most popular models for now. All of our DVRs support max 2TB HDD and Max to 64GB SD card, which can record 24-hours continuously for almost one year.