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 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. Colour: blue Material: PC+metal Size: 41x28.5mm Package Contents: 2 * JSN-SR04T Ultrasonic Distance Measuring Transducer Sensor Waterproof Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.