BSD System: Helps drivers to monitor their blind spots and effectively improve driving safety in the following driving environments. 24Ghz Millimeter Radar: This system product can warn the dangerous targets in the adjacent lanes. Early Warning: During driving, when the side and rear vehicles are in danger of colliding with my car, the warning light strip will light up to remind the driver. If the left/right turn signal is turned on, it will be accompanied by an audible warning. The blind spot detection system can distinguish between stationary objects and moving objects. Stationary objects do not alarm. Pedestrians and vehicles in a driving state will sound an alarm when they are detected. When waiting for traffic lights: After parking, the car behind is still, and the blind spot detection system does not alarm. Normal driving: When the car behind is slower than us, there is no danger of collision and there is no warning. Similarly, when we overtake, the speed is faster than the car behind and there is no warning. Highlight warning light strip:A:Red Light/B:Blue Light/C:Green Light Colour:As Shown Material:ABS Package Contents: 2 * Radar(Cable length approx. 0.8m) 2 * Radar adapter (1.5m (one side) + 2.5m (one side)) 2 * Highlight warning light strip(approx. 0.75m) 2 * Highlight warning light strip extension cable(approx. 4m) 1 * Buzzer(approx. 0.17m)(please unplug it if it's annoying to hear, it doesn't affect function) 2 * Radar mounting bracket 1 * Power extension cable (approx. 2m) 1 * Power extension cable (approx. 4.5m) 1 * Mounting accessories kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.