The kit consists of ultrasonic sensors, digital display, loudspeaker, control module and power cord. The system detects the distance between the vehicle and an obstacle thanks to ultrasonic sensors installed in the bumper. The display shows the distance to the obstacle, the four-colour display and the sound frequency indicate the safety zone. The driver can judge the distance, avoid the obstacle and prevent an accident. Detailed instructions inside the package. In the package:• 4 x Sensors with a cable equipped with a 2-PIN plug. Cable length: ~ 2.5 m. At a distance of approx. 15 cm from the sensor, there is a hermetic connector on the cable, which in the event of disassembly of the bumper makes it easier to disassemble the sensors without having to disarm all their wiring in the car;• 1 x Control unit;• 1 x Power cable for the control unit with a 3-PIN plug. Cable length: ~ 1m;• 1 x Double-sided adhesive tape for attaching the control unit;• 1 x LED display with attached power cord (~ 5.6m) and double-sided adhesive tape for attaching it.• 1 x Speaker with attached power cord (~ 5.6m)• 1 x Drill bit - Φ22.5mm• 1 x User manualSpecifications:1. Rated voltage: 12V2. Operating voltage range: 10.5~16V3. Rated current: 20mA~200mA4. Detection distance: 0 - 2.5m5. Ultrasonic frequency: 40kHz6. Control unit operating temperature: -30 ~ +80°C7. Display operating temperature: -20 ~ +60°C8. Speaker operating temperature: -30 ~ +80°C9. Sensor detection angle: 90°10. Sensor response time: 300ms11. Sensor diameter: Φ22.5mm12. Audible alarm when obstacle is detected within the distance range: 0.1m~1.5m13. Audible alarm volume: 73 dB14. Maximum power consumption: 3.6W15. Current consumption: 50~180mA16. Display Dimensions: Width x Depth x Height = 13.5cm x 1.7cm x 2.0cm17. Control unit dimensions: Width x Depth x Height = 9.0cm x 6.0cm x 2.2cm