The new Encore BDS-4 is a 4-sensor system that will give an audible warning when the driver turns on his turn signal if there is an object in his blind spot.
The unit includes a main brain and four sensors plus LED indicators that mount on the inside by the right and left mirrors that illuminate when a vehicle is in the blind spot.
It also includes a wiring harness, and it allows for adjustable audio volume.
The sensors can come in white for easy painting.
You can view the BSD-4 here.
The system is available through Memphis Car Audio at a suggested retail price of $499.