In summary, there are several Knowles microphones which are suitable for use in ultrasonic applications. Depending on the specific requirements, one microphone may be better-suited than another. The FG series is suitable for ultrasonic applications, and is available with two frequency responses, normal and damped. The MEMS microphone, SPU1410LR5H, is often used when SMD mounting is required. Several can be mounted on a PC board in an array for applications such as position and gesture detection. Lastly, in high sound level applications, such as gunshot detection or triangulation, model EK-26899-P03 is a good choice. With a proper understanding of the microphone characteristics the user can design robust, high-performance ultrasonic devices.