1
what’s the use? after
fog light emitting brighter, stronger penetrability, can alert the weather when poor visibility driving the car safety.
2
Error:
· rear fog lamp switch is not a way, there knob, the pull type, tap type.
· some models with only one side in the taillight.
3
reading:
Laser rear fog 
Audi has designed a very “high-end, the atmosphere, the grade” laser rear fog lamp. Although the traditional fog lamps have a strong ability to penetrate, but in extreme weather conditions, fog lamp beam or likely to be affected thereby weaken the haze of penetration of the beam. The use of a laser rear fog light emission characteristics of the laser beam directed to improve this problem. Fog light emitted by the laser fan-shaped laser beam obliquely downward directed towards the ground, while suggestive of the vehicle functions, but also to avoid the influence of the rear of the driver beam.