We all know the role of the tachograph, a few years ago in Nanjing Peng Yu case, so that the instrument gradually fire up here once again to everyone popularity, tachograph that records the vehicle on the way video and audio equipment, and other related information . After installing the tachograph, able to record the whole process of cars with video images and sound, may provide evidence for the accident. People who like traveling by car, you can also use it to record conquer difficulties and obstacles in the process. When driving walking video, while the time, speed, location, are recorded in the video, rather a "black box."