Dual CPU Car Parking Sensor System with LCD Monitor and Step-up Alarm Weatherproof Sensor 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.