Hiletgo 2Pcs Jsn-Sr04T Integrated Ultrasonic Module Distance Measuring Specification? The basic working principle: Package Included: With a waterproof sealed emitter. This sensor is suitable for outdoor applications such as car reversing sensors, security alarms, industrial inspection, etc. Integrated with wire enclosed waterproof probe, suitable for wet, harsh measurement occasions. Please note that the device is waterproof, but it couldn't work underwater. Working voltage:DC 5V, Static current:5mA, Total current work: 30mA. Working range: 25cm-4M, Working frequency: 40KHZ, Detecting angle: 70 degree. The module has a variety of modes that can be modified manually, suitable for testing and teaching experiments in different occasions. Application: Horizontal distance messurement,Obstacle avoidance, automatic control, Traffic control, Security, industrial control.