BY-J 77 GHz Millimeter Wave Radar 12V Universal Car Blind Spot Detection System, BSD, LCA, DOW, RCTA, AOA, Black, 1 Pack

I have installed a few of these for my customers, and they have always reported false alarms. I bought this one because it was more expensive than the rest, hoping it worked better.While it did work better, I still get many false alarms. It is better than not having anything At all, but, I will probably be disconnecting the buzzer.

I bought this even though the bad reviews had no comments. The good reviews seemed questionable.It came in a brown unmarked box which should have been a signal about quality and reliability. Good products come in well packaged and marked boxes. No instructions. All signs of cheap Chinese products.Tested system before doing detailed installation. LEDs worked but sensor (77Mhz microwave) did not respond to either people or vehicle. DOA. So, I have returned it as defective and will see if I can find a more reliable product. At $225+ I thought it might be quality but it isn't. Their quality control is bad when you let a product go out DOA. You could get lucky but likely a "lottery" on getting a working one.If it worked, it appears it could be a nice product.

Great adds on for my car

This only works for cars approaching from behind not in passing not in reversing and the car must be on to use the door opening feature (which is basically useless because how often are you leaving with your car still on!

Worked as stated on the description, but as I missed the part on the description stating “when you are waiting for traffic lights: after the car stops, the car behind is a fixed object. Moving vehicles, pedestrians, bicycles and motorcycles will sound an alarm when they are monitored”, it is kind of annoying hearing the buzzer for anything that pass near you. I did purchased a second kit for my wife’s car and she asked me to return it and find another option because she did not like the idea of hearing the buzzer every time a car pass by you event if the blinker have not been activated.