- Automatically engages as soon as you place your car into reverse. at the back of the vehicle. And mount the display unit at the front - all it needs is a 12V power supply! - High-tech processing,- Omnidirectional detector sensor,Beautiful linetype figure ??No need to run a wire from the front of the vehicle to the rear. Just connect the sensors and control box - Embedded detector sensors (which requires installation into your rear bumper) - Show distance by wireless digital LED lamp/LED display,Bi Bi or Speaker voice warning.