Through the details on the following to let us get more aout our Ultrasonic Range Finder AR841:
 

The ultrasonic points to strong so the energy consumption slows down the spread in the medium distance, and often used in ultrasonic distance measurements, such as range finders and material level measurement instrument etc, can be achieved by ultrasound. The use of ultrasonic testing is often more rapid, convenient, easy to compute and easy to do real-time control and measurement precision to achieve the requirements for industrial and practical, and therefore on the development of mobile robots has also been widely used.