1.3 sensors install in name plate and detect obstacle distance;                                                                                        

2.Wireless small LED display show the distance and alarm by 3-step bi-bi sound                                                                               3.DIY install                                                                                    

4.Detection range: 2.0m to 0.3m acoustic signal increases in frequency
5.The plate  size:550mm*140mm
6.Alarm volume:65dB,Work temperature: -40°C~+80°C
7.Display size:100x20x18mm
8.Wireless between the display and control box
9.sensors can add waterproof connector,easy to replace when defective