Preview SAS  back up alarm 

As the designer of the first patented electronic reverse alarm, we knows back-up alarms. With PreView SAS we integrated a heavy duty reverse alarm with our patented pulsed radar sensor, providing operators with an internal and external vehicle warning system to help them avoid backing accidents. When an object is detected in the vehicle’s blind spot, the operator receives an in-cab alert, while simultaneously triggering the PreView SAS alarm to alert those outside the vehicle of impending danger.