Manorshi is a high-tech manufacturing enterprise in the field of acoustic technology, which recently organized an exciting team building adventure for its employees. The adventure took place by the beautiful Tianmu Lake and included a series of outdoor challenges aimed at testing the employees’ prob

The sound wave frequency that human ears can hear is 20HZ～20KHz. When the frequency is higher than 20KHz, the human ear cannot hear it. Therefore, we call the sound wave with a frequency higher than 20KHz "ultrasonic wave".Ultrasound has a strong directivity and travels a long distance in the air.