What makes a good car dvr?? where can I get a car dvr ? what’s the best ?it must be 1high definition 2,the mobile detact function. 3 can play back. .4High speed recording and quick light respond where can I buy it much cheaper? I have found one on internet ,,the price is really reasonable ,much lower than other brands ,but I can not sure with the quality ,are there anyone who can tell me more information about it ?? <Link removed because I'm a spammer>