The product has two kinds of packages, 1: one is display + host + sensor2: One is sensorFeatures:4 sensor system, double CPU and advanced chipset for enhanced coverage and detection (0-2m).With digital colored LED display (number & light).Help to prevent dangerous and costly collisions.Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle.Detect small children and low walls as well.Anti-freeze and rain proof.Easy to install.A saw drill head included.Specification:Type Car parking radarMaterial PlasticQuantity 1pcsColor BlackRate Voltage 12V DCRate Operating Range 9V - 16V DCRate Current 20mA - 200mADetecting Distance 0-2.5m / 0-8.2ftUltrasonic Frequency 40KHzControl Box Working Temperature -30 - 80 celciusDisplay Working Temperature -20 - 70 celciusLED Display Size 9*1.5cm / 3.5*0.6"Control Box Size 9*6*2.2cm / 3.5*2.4*0.9"Display Weight 0.088kg / 3.1ozPackage:1*Main Control Box