The car tachograph can generally record the front of the car within ten meters of the range, of course, the tachograph quality is good and bad, its function is also some more powerful, and some only as a driving record to use believe that a better tachograph can be enlarged or high-definition state, but the general tachograph installed in the car above, There is no problem in the range of 10 meters in front of you, and you can fully distinguish the color of the vehicle or the clothes worn by the pedestrian, such as the approximate height and weight.
Tachograph front usually see the first 15 meters of the car is no problem, is the problem of clarity.
The wifi signal coverage of the mobile phone network driving recorder is about 10-20 meters. If the recorder can also be inserted SIM card, through the network, remote capture pictures, videos, real-time remote broadcast, positioning location and other functions on the mobile APP, without any distance restrictions.