Parameter: 1Input voltage: DC 10-30V 2Work current: 100mA 3>.Blind distance: 0-20cm 4>.Range of planar objects: 20-500cm 5>.Output mode1: UART serial port 6>.Output mode2: Relay 7>.Display mode: LCD1602 display 8>.Relay power: 220V/1000W 9>.Work period: 100ms 10>.Response time (one probe): 1s 11>.Response time (two probes): 2s 12>.Response time (three probes): 3s 13>.Response time (four probes): 4s 14>.Measurement accuracy at normal temperature: 1+(S*0.3%) 15>.Probe center frequency: 40K10.K 16>.Probe number: 4 17>.Button number: 3Keypress Description: 1>.SET(P3.5): 1.1>.Long press to enter the Settings page/Exit the Settings page; 1.2>.Short press to enter the parameter selection in the setting page; 2>.DOWN(P3.2): 2.1>.Short press the parameter value to decrement; 2.2>.Long press the parameter value to decrease quickly; 3>.UP(P3.3): 3.1>.Short press the parameter value to increment; 3.2>.Long press the parameter value to add quickly; 4>.Probe working indicator light: The indicator blinks when the power is on; 5>.Relay output indicator light: When the probe distance value reaches the set value, the relay output indicator light is on.Package:1x DC12V 4Bit Ultrasonic Range Finder Module4pcs xUltrasonic wave sensor About this item It is a DC12V 4Bit Ultrasonic Range Finder Module 4-CH Relay Switch LCD1602 Display 20-500cm Adjustable Distance Tester for Alarm. Four Probes Work At the same Time With Key Control Mode The Probe Has A Certain Grade of Dustproof and Waterproof,With LCD1602 Display Parking space detection.Intelligent Home.Intelligent garbage can detection.Collision avoidance detection in car blind area SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied. It is a DC12V 4Bit Ultrasonic Range Finder Module 4-CH Relay Switch LCD1602 Display 20-500cm Adjustable Distance Tester for Alarm. Four Probes Work At the same Time With Key Control Mode The Probe Has A Certain Grade of Dustproof and Waterproof,With LCD1602 Display Parking space detection.Intelligent Home.Intelligent garbage can detection.Collision avoidance detection in car blind area SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied.