Automatically engages as soon as you place your car into reverse.</br>Show distance by Rainbow-LED lamp/LED display??Bi Bi voice warning.</br>Embedded detector sensors (which requires installation into your rear bumper)</br>High-tech processing??- Omnidirectional detector sensor??Beautiful linetype figure.</br>Easy installation.</br></br>Product Description</br></br><br><b>***Please kindly notice before purchase***</b>:Order will be shipped via prior registered airmail(7-11 days delivery time when parcel shipped out??<b>NOT</b> 17-28 days indicated by amazon system)??Tracking number is available. We save shipping postage for buyer from this.Thanks for your understanding!<br>Rainbow LED Display Parking Radar Sensor Car Reverse Backup Radar</br><br/>http://www.amazon.com/gp/product/B004Q9LQ0E