Product Name: Car LED Display 4 Sensor Reverse Backup Radar Buzzer Parking System [CP208] Feature: Rate Voltage:12VOperation Voltage range:9-16VRated Current:20-200mADetecting distance:0-2.5mUltrasonic Frequency:40KHzWorking temperature:-30°C +70°CDisplay working temperature: -20°C +60°CSensor`s Color : BlackNote: Please pay attention to the different on the size of the driller for camera and the sensors.When install the system, the car should be in power off situation.The performance maybe affected in the following situation: heavy rain; the gravel road, bumpy road, sloping road and bush; very hot, cold or moist weather, the sensors is covered by snow, ice mud, etc.Other ultrasonic or electric wave, the instance of DC/AC switch or 24/12V switch may affect the performance of the system.The sensor should not be installed too tightly or too loose.The mental bumper may affect the performance of the system.Don`t locate the control unit near to other interference such as exhaust pipe or other wires.Test the system to make sure it works well before using.This system is a reversing aid and the manufacturer takes no responsibility for any accidents caused after the kit is installed. Package Includes(1 Set):