ePathChina&reg; Dual CPU Car/Truck/Vehicle Mini Car LED Display 4 Sensors Kit Reversing Parking Sensor/Backup Sensor/Reversing Sensors System Radar Buzzer System,Periodic Buzzer Alarm, LED Rader,Three Stage Bi-Bi Sound Alarm - Black Color Easy to install.Intuitive and easy to use.Protect your vehicle and others. System automatically activates when reverse gear is engaged. Dual CPU system.Step-up alarm.Intelligent anti-interference analysis. Obstable of orientation indication.Operating temperature: -40 degree to 80 degree. Sensors installation height: 50cm - 70cm.