The product has two kinds of packages, 1: one is display + host + sensor 2: One is sensor Features: 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 radar Material Plastic Quantity 1pcs Color Black Rate Voltage 12V DC Rate Operating Range 9V - 16V DC Rate Current 20mA - 200mA Detecting Distance 0-2.5m / 0-8.2ft Ultrasonic Frequency 40KHz Control Box Working Temperature -30 - 80 celcius Display Working Temperature -20 - 70 celcius LED 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 / 3.1oz Package: 1*Main Control Box 1*LED Display Indicator 4*Parking Sensors with 2.5M/8.2ft Line 1*Hole Saw 1*A saw drill head 1*Power Cable 2*Double Side Sticker The product has two kinds of packages, one is display + host + sensor, One is sensor