1.bus dvr/vehicle dvr 2.Anti-vibration, anti-shock mounted case; 3.h.264 ... dvr's specification:1) GPS, speed, positioning and monitoring;2) 3G wireless video transmission function;3)Driving record;4)Intelligent ... with common brand in the market,32GB/for each card.2.SD card’s function with storing files,supporting video ... : 4 channel H.264 Bus DVR with GPS function,2 SD-Card Recorder SP-4000A